one piece of advice i'd give to anyone trying to start a playing group, is pick your battles.
countless times i see people take a fatal course of action because they act with their ego instead of their brain. if someone pushes you around or takes your zone or whatever, if you're not in a position to do anything about it at that current time or you think you'll lose, pretend to let it go. bide your time. then attack them without warning with a full group, preferably on 4-5 of them with the most equipment so you can garuantee the highest kill rate.
don't be that idiot that gets into a verbal arguement when you're in a situation where you have the lower hand which degrades into an unfavorable war. don't let your ego take over, play smart. pretend to submit, then stab them in the back - hard.