if your just playing with some friends, why not play with it. grappling is fairly natural, obvisouly proper instruction would help you pwn these fools, but your just messing with them. im sure you wrestled with friends as a kid. if your smart with it you can pull or push him all over, just catch his weight when he moves and haul on it to keep it moving.
when hes trying to steady himself then you can tag him with a few good shots. if your quick you can fake a shot at his face and when he leans back to aviod it shoot in for a leg take down, or make a kick to his grion and he might bring his hands there to defend, so you can either grab his head and neck, or snatch one of the arms he defends with and tug on it or what have you.
play with it, use your strikes to open spots for impromptu clinching. play with it.
its not supposed to make sense