A good controller setup is Alternate 2 which is basically the same controls as COD games.
As to the aiming, if you're close, don't bother to aim it just hurts you. This game can be a bit frustrating and takes a little getting used to. But after a bit, you can find a good camping spot in all games and pick people off, or just flank them and kill lots of people.
The health system is pretty weird too.
Last, the movements are very exaggerated if you know what I mean so you have to take those into consideration.