well i would think that the m4 is a good one to start with,if that is what you like.ya don't want something that you don't like.
as for finding game you will have to get age verf.to find the games on here.
as for you having time i can't say,but if you like the sport it doesn't really matter how often you play as long as you get to play.
well hope that helps you out.
oh and hope to shoot you sometime hehehehe