I'm gonna have to agree with Donster, While its fun to do combat rolls until you can't stand up anymore, would you really be willing to do that and risk breaking your new toy? haha. Just do some plinking, set up targets at various distances and go to town. The reloading thing Donster mentioned is also crucial. It helps to get your vest/tac rig set up, with your mag pouches, etc, so you can practice reloading with the rig you're going to use to play.
I knew a man once who said "Death smiles at us all. All a man can do is smile back."