Hmm well it slightly depends on what lvl PVP zone you are in. as /forcefield, you will bloom only after you get force bubble which can be so-good-its-nearly-broken against those who dont know how to counter it. But you can't get forcebubble before warburg iirc. Good news is also that you are one of the few trollers to get mez protection from your sets (dispersion bubble).
Bad news is that your damage sucks. So solo PvP will be a pain, unless at very high lvl when you have epic attacks which help a little. As your primary attacks, spamming dominate on an opponent that is pinned to a corner with force bubble/telekinesis will propably break his mez resistance eventually, but you will propably need to team with someone to get the kills. Keeping all those toggles up will also eat a lot of endurance.
mind/ff is pretty good team pvp toon.
Like one of my mates so aptly summed up, mind/ff trollers warcry should be "Be prepared to move in the wrong direction!"
EDIT: to explain slightly, both telekinesis and force bubble do extremely useful repel against which very few people have repel resistance. Using repel to protect you while spamming single target mezzes should be your plan.
Thank you for answering so soon.
In Siren Call the crime happend :P, so I didnt have Force Bubble, Force Prison etc.
And I know is a team toon thats why I took him. I didnt get to lvl 50 by myself 
, but being new in PvP I want it before I team up to have practice a little so the future team will not lose the battle because of me.
Hammerfall gives useful advice in his edit there. Detention field can also be extremely useful in PvP allowing to remove one enemy from the fight while you take on another.
Octavian Vanguard
@ohmsEU and @ohms 2
Badging character: Bimble on the Union server, Badgehunter.com and City Info Tracker.
I do agree on most of the things but this is not true 
[ QUOTE ]
at very high lvl when you have epic attacks which help a little
[/ QUOTE ]
ST hold deals more dmg now than epic blast, eats half the end and it holds. Epic blasts are now a waste of power and no, they won't help much, u'd better skip them
I did say 'a little'
I just dont have highlvl trollers myself so I had to give a cautious statement.
[ QUOTE ]
I do agree on most of the things but this is not true
[ QUOTE ]
at very high lvl when you have epic attacks which help a little
[/ QUOTE ]
ST hold deals more dmg now than epic blast, eats half the end and it holds. Epic blasts are now a waste of power and no, they won't help much, u'd better skip them
[/ QUOTE ]
I dont know dark i still need the extra attack at the lv41+ range to help out with my damage output which would suck even more without it 
As for a mind Force fields you have an extremely viable pvp build which i have to say makes me somewhat jealous on my mind/ empath Not only do you have force bubble, tk and natural mez protection, you also get detention field another uber handy power that takes folks out of pvp
Being Mind/Emp probably good, as you can afford it due to mind's low dmg output, and RA available, but for trollers in general it's a poor choice imo for the reason i stated
Actually to the epic power I took Primal Forces to get the Power Boost to increase my controll powers
being mind you also got the power of sleeps.. while they wont lock down a target while you pound on em, its ideal to drop some toggles on characters without inherent mez protection. For instance when fighting a squishy running acro, you can use sleep first and then immediately a hold after. Also other bubblers running dispersion bubble will hate sleeps, as its the only toggle-dropping mez they havent got resistance against.
"god, how many devs did hami have to sleep with to get ED?"
Total Cat @Stagefright
Trollers hold go through acro 
thePhilosopher Martial Arts/Regen/Fire Scrapper
theRegulator Empathy/Energy/Soul Defender
Total Inertia Ice Blast/Kinetics/Psy Corruptor
Total Inferno Ice Blast/Thermal/Leviathan Corruptor
bah.. that oughta teach me to touch the funny **** pre-posting.. anyway still nice for disp bubble
"god, how many devs did hami have to sleep with to get ED?"
Total Cat @Stagefright
thePhilosopher Martial Arts/Regen/Fire Scrapper
theRegulator Empathy/Energy/Soul Defender
Total Inertia Ice Blast/Kinetics/Psy Corruptor
Total Inferno Ice Blast/Thermal/Leviathan Corruptor
Sadly I have to say that last night I got my beep kick in PvP.
I dont know if it was just because I am Noob or because the were 3 of them and I was all alone
My toon is lvl 50 troller MC/FF. Is there any chance I could survive in PvP zone and how?
Looking for some advices from choosing of the powers to enhancement, tactics, macros, combos...anything could be usefull