Hi there! 
Always good to see a new RPer! If you're on Union, I recommend the GG meet - far from the only RP and not everyone's cup of <insert beverage here> but still reasonably easy to walk up to and join in. Drop by and listen for a while to get the gist of things then just say "Hello"*
*Actual greeting may differ.
As for general guidelines, I imagine not everyone will agree 100% but these are the ones I try to abide by:
- In character (IC) actions have in character consequences. E.g. If A's hand gets broken, logically it remains broken until it heals or is healed. (Not a great example but I hope you get the gist 
)
- Do your best to keep Out Of Character (OOC) information separate from IC information. You the player may know something about someone's character but that doesn't mean your character knows the same thing. E.g. the blue names floating above characters heads aren't there IC...
- Godmodding. This occurs chiefly when you have your character perform an action on someone else's character without their permission. E.g. 'A punches B.' A has decided the outcome of the action giving B no choice. 'A throws a punch at B' would be better (slightly, at least - no one wants to be punched at ) as it lets B decide to let the punch connect, dodge it etc.
Apologies for the length of the post but I hope some of it is helpful, if not all.
Anyway, have fun and I might see you in game!
If you villianize a little more, try the Clocktower, Its hwere the fortunata fateweaver is. Both GG and CT start at 9,by the way. If you see Bizzare or Wynd Flysh at either of these venues, i'll be happy to RP with you*.
* Does not accept any responsibility for broken or dislocated arms or feelings of WTH? or emotional insecurity 
Feel free to join the "GGOOC" channel, to my knowledge the largest collection of RPing players even if they don't all attend GG (regularly)
More Clock Tower specific is "CTOOC", but how specific, I wouldn't know.
Lots of information on RPing can be found on the GG Wiki.
Some might even be useful
GG Wiki
To help, I've picked out two that probably gives you (most of) the information you're looking for.
GG's Basic Conduct 'guidelines'
It says it's GG's, but you'll find it applies to most RP scenes as 'common sense'
GG RP FAQ
Some questions answered.
Some questions are GG specific, most just RP in general
I hope this helps, I think there's a good RP Guide in that section, though was (re)posted just after the board whipe so expect to find it on one of the last pages
edit: Found it! Basic RPing guide for heavy/immersive communities
and as said, these aren't the 'be all, end all' rules, more guidelines to help you out in finding your way to your own comfortable style
@ShadowGhost & @Ghostie
The Grav Mistress, Mistress of Gravity
If you have nothing useful to say, you have two choices: Say something useless or stay quiet.
I'm usually at GGs pretty much every night except Wednesdays, feel free to come say "Hi" or whatever.
I do recommend taking a look at Shadowghost's links in the post above: well worth it.
But most of all, come along and enjoy yourself!
The wisdom of Shadowe: Ghostraptor: The Shadowe is wise ...; FFM: Shadowe is no longer wise.
; Techbot_Alpha: Also, what Shadowe said. It seems he is still somewhat wise ; Bull Throttle: Shadowe was unwise in this instance...; Rock_Powerfist: in this instance Shadowe is wise.; Techbot_Alpha: Shadowe is very wise *nods*; Zortel: *Quotable line about Shadowe being wise goes here.*
Cheers for the replies, i might just drop by to GG one night, 9pm yeah, ive got an extended backstory, as coh wont let me fit it all in, so if anyones interested ill post that too.
Hawk
A story? ---> Creative
Just post the link here afterwards!
Hihi and welcome 
One bit of advice, if rping with people make sure they know I was in some confusing teams this week where I was never to sure if we were rping or not .
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A story? ---> Creative
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Yeah i meant on the forums in general, should have specified that
Hi, ive been playing this game for just over a year, and over the last few weeks been browsing the RP forum, and thougt it looks like it could be worth a go, so i made a hero with a decent backstory, and now im stuck, so any guidelines and what and when to be where will be greatly apperciated
Hawk (RP character Flux.)