Essence boost and Reform Essence are both good heals and very handy. Incandecent Strike and Radiant Strike are good solid attacks and you'll want to pick them up as soon as possible. Solar Flare is good but causes knockback - handy for keeping people off you but annoying at the same time (knockup would be so much better). If you are thinking about tanking in Dwarf then I'd go with Conserve Energy and Hasten - should solve the End problems in dwarf form and allow you to cycle attacks pretty fast.
Dawn Strike is fun but not that handy due to it's lack of power. Photon Seekers are stupid but good as a 'mini-nuke'. The human blasts are mostly poor (except gleaming blast) but you'll probably need one or two to fill the attack chain.
Slotting wise you need to focus on one form at a time. You'll end up being poor in all of them if you try to spread slots about. Easiest option is focus on Nova first (great for the lower levels and you only really need the AoEs slotted) followed by human and finally dwarf. Or if you wanted to get into tanking sooner, respec out of Nova at 24 and put the slots into Dwarf and then slot Nova up later on. I'm tri-form and had almost enough slots to get everything the way I wanted but didn't manage that til level 50. 
Really good advice, I agree with everything.
Thank Faultline, this is great advice.
Id say it depends on what build your going for, if your going for a tri build slotting can get a bit tricky, with my pb i went human/nova until lvl 30 then pure human as it gives more slots to play with.
As for powers faultline seems to have covered the basics well but again depends on your build, good luck though pb/ws can be tricky took me 3 respecs to get mine how i wanted
personally I dont see how you have end problems in dwarf form (unless you fight sapper-type enemies of course). Also if your playstyle is tanker/scrapper you may wanna ditch nova at higher lvls and focus on human/dwarf form (do take it at low lvls though, as its great damage compared to others of your lvl). Then again, you'll easily find out what build suits your best once you start playing them. Kheldians are the most personalized AT you can find in this game.
"god, how many devs did hami have to sleep with to get ED?"
Total Cat @Stagefright
With hasten running I can run out of end in Dwarf after about 1 minute of attacking and thats with Dwarf Flare slotted with an endred. You could slot the form with endmod of course but I'm not sure how much that would help? Plus conserve energy is very good for human (and with lightform can give you about 3 mins of qauntum flight too).
didnt say dont take conserve energy, its a power thats always useful got my black dwarf (as i dont like PBs that much) slotted with 3 endmods, and I barely run outta end, even with hasten running.
"god, how many devs did hami have to sleep with to get ED?"
Total Cat @Stagefright
It's mainly dwarf flare - 18 End actvation cost. Not huge but adds up pretty when using it a lot (which you need to really). And as PB dwarf is not exactly high on damage, fights last a lot longer. 
Gotta agree with most said on here. Its all about the squid form! That will take you through the early levels. I'm currently doing the same with my PB i'm aiming for a Squid/Human combo to 50.
Just such a shame i never play anymore...
Dinged 50 in march and only have a 17 kheld! 
I played a lvl 40 human form scrappery PB in test server event with stamina/acrobatics and it was propably the worst character ive ever taken to PVP.
The problem is the same as the one we have in PvE - no status protection! You get held/stunned/slept half the time. I think PBs have to focus on short bursts of action. Try conserve energy, hasten and your attacks slotted with a recharge. The damage is pretty impressive and your heals are up pretty quick too. You'll need a breakfree or two, someone with CM or lightform at higher levels to make it work but you should be able to take on anyone. For a minute or two at least.
Don't dismiss nova or dwarf either. Nova can be used to hunt down a runner on low health and dwarf is perfect for a big heal and the ability to tp away when things get bad. I used to annoy loads of people doing that.
Yes, I see you know what you are talking about I was preparing my next post of two words "mez resist"..
I see only one way for kheldians in pvp and that is dwarf form. 90% propably in it and the rest is when dwarf gets toggle dropped.
One thing that really irked me in the event was the lack of insp sellers, hence no bfs. I dont think PB had good enough damage capacity to justify the lack of mez resist.
Team with controllers, stick close to them and voila, you have mez protection. All human peacebringers are made to shine in teams. If you are playing one only solo, you shouldn't really judge. That's like saying Empathy is a useless powerset.
Dwarf just won't do enough damage quickly enough tho. And if you do wear them down they just run and dwarf isn't the best for following someone...
The tactics I found that work are find yourself a squishy and sneak up on them (or tp next to them using dwarf and instantly change back to human) and hit IC. If you can hold them and keep them off their feet for long enough, you can finish them off. Either that or it's get yourself some mez resist and wade in for a couple of minutes of carnage.
We seem to have gone slightly OT....
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The problem is the same as the one we have in PvE - no status protection! You get held/stunned/slept half the time. I think PBs have to focus on short bursts of action. Try conserve energy, hasten and your attacks slotted with a recharge. The damage is pretty impressive and your heals are up pretty quick too. You'll need a breakfree or two, someone with CM or lightform at higher levels to make it work but you should be able to take on anyone. For a minute or two at least.
Don't dismiss nova or dwarf either. Nova can be used to hunt down a runner on low health and dwarf is perfect for a big heal and the ability to tp away when things get bad. I used to annoy loads of people doing that.
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I agree, it's very annoying when u get a ganking stalker down to low health when he tried to AS you, then he has to run away or use placate. nova good for chasing and damage dealing then u can shift into dwarf to finish em while they're down. I'm no expert on pb's and hope to get one soon but I just like to give my opinion. PS. I love knockback, perfect in pvp.
hehe why run for 1 pb..dwarfs are to slow and nova/human are to easy to MEZ up:P (I must say..PB's have great heals for pvp)
Maybe. But you find yourself a nice squishy villian, eat a red, pop buildup and drop behind him for IC and RS and I can tell you that trying to mez you is the last thing they are thinking about.
Thats when having the nice gunship that is Nova can be great as they try to leg it and have no idea where the shiny blasts that keep hitting them are coming from.
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Maybe. But you find yourself a nice squishy villian, eat a red, pop buildup and drop behind him for IC and RS and I can tell you that trying to mez you is the last thing they are thinking about.
Thats when having the nice gunship that is Nova can be great as they try to leg it and have no idea where the shiny blasts that keep hitting them are coming from.
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pfff..sod that...*pops BU at red health and does nrg transfer for a suicidal debtless death^^*..ha you didn't got me:P
Hi Guys
I should ding 50 this week, I was just wonderung what would be the most useful powers to pick up and why?
Im lokking to do tri form and my play type is scrapper/tanker, i want to give pain and be able to take pain as well.
thx in advance.
P.S How to slot would be useful as well.