Winter Gamez

Im a gamer that has slowly withdrawn myself from COD, but when i play Halo I get destroyed. I am looking for some guys that can teach me how to play. I enjoy SWAT but im not very good. I am 42 so my reflexes arent what they where thus my need to better understand this game. If interested my gt is Winter Games and ihave the MCC plus halo 4 on the 360.