Every game, if developed enough, has its own guides provided both by staff, and by players, that offer information on the different types of alliances, guilds, crews, posses etc (whatever their terminology is), as well as how to make one function successfully.
the main thing is people play games to de stress and have fun, so find one that plays the way you do, and has similar goals in what they want to achieve. You meet some new friends, and have fun, and maybe, if you're like some of the old timers, geek out over common interests.