Definitely change those rear rims your tires shouldn't stick out that much whats your wheel offset in the rear? Maybe its just your rims they look really deep. To start drifting you just need some drift tires go with some from here their cheap and will last you at least a year http://www.raikoudrifttires.com/ it looks like you will be primarily driving on really rough asphalt go with the drift tires that have either one ring in them or two or you could get the set of three with all three types of tires they offer that would be your best bet so you could try out the feel of which you prefer