First thing first, do you have the right tires. If so, then let's start off with that nothing can replace wheel time. Getting out to an open(smooth) parking lot with a couple of cones and just doing it is the best way to learn. As far as throttle advice, just keep in mind that throttle input is what makes the car turn. Also, starting with a stock motor will help with throttle control. Once the car is sideways, the more the throttle, the more it wants to stay sideways. Tighter turning radius requires less throttle.

Hope that helps.
Billy-Ho
yrs Drifting..about 2