if you want to learn and understand about all the gear you will need, buy a stock and build it up, expect to pay over $10k for a build up! there's nothing worse than a kid buying a KE70 and thinking its gonna cost him $500 to be a made drifter!

if you want dodgy do as stated above, AE71, cut springs, locked diff, sway bars, strut bar, and you can have fun in that, as long as you don't mind being defected all the time

if you want to start drifting straight away, buy something already prepared for it, it will save you money, time and a lot of effort!

$6k will get you a KE70, complete with 4AGE and suspension.
$8k will get you a AE86, complete with 4AGE and suspension.