Will I be able to play with xbox360 controller? And there will be aim assist?
you can get xbox pads for use on a pc but it needs to be a xbox and windows one which costs around £40 from pc world
Yes you can use a controller, just about any controller will do to be honest.
No there will be no aim assist as cheaters and hackers will find a way to use it as an entry point for aimbots.
Not likely in Infinity Ward's CoD games. If they did support that, I would be shocked. Treyarch has supported it for Black Ops, but I don't believe IW will as they rarely try anything in their CoDs and IF they did, it wouldn't have aim assist.
Try using Joystix Pro. Its free to use and I have not had any issues with it so far. its here: http://www.joystixpro.com oh and its free.
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