Basic Roleplay rules.
Put things in brackets when you're talking out of Role play. ( Like this. ) (( Or Double brackets ))
And... Either use *'s or -'s or ~'s for actions etc.
That's pretty much it. It would be best if you Wear the clothes of your character for appearence.
And finally the character. You can create a character which is permanent where you write a story bout' it on your profile. Or use a temporary character which you have to use a character sheet for.