(OO)SKYLINE(OO)
Lowering the car will reduce body roll. If your buying the TT01D series then it's already got most of the simple mods to get you going:
-oil shocks
-ball bearings
-alloy driveshaft
and some other stuff.
The matte finish is slightly tricky. Instead of painting from the inside, some guys get the matte finish from painting the outside. To fill the guards you don't have to get wider wheels, just a higher offset number.
The car will get dusty after some time; to clean it, buy yourself a cheap paint brush and brush it down after use. That or you can use an air compressor.
Smooth track is preferred, for me anyway. I have no problem drifting on asphalt but it's abit slower due to the limited grip you get.
And what bubba said, you don't have to go nuts on modding the TT01. It can get costly and won't be as rewarding as the newer/better chassis out there. Keep it simple and just have fun with it really.
cheers