The easiest (and cheaper)way is using a Wired 360 controller.
If you already have a wireless controller you will need a wireless receiver.
Those run about 20 bones and can be hard to find.

Here is your guide
1.Download the Driver/Software package __HERE__
2.plug and play

as long as the game(s) in question supports game pads you should be good to go

*not @ OP is it really that hard to answer a question without giving him shit about how he wants to play