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With that, you can drift on the stock suspension just fine. After that, in this order (IMO):
1. Wheels/tires 2. Struts/springs. I'd jump straight into a coilover setup like Jic or Tein.3. Stiffen the Chassis. Start w/ strut bars and sway bars.4. Quicker steering.5. Race seat.
PS - You'll need power at some point too. I'd say after the coilovers. Brakes should be done as well. At the very least, you'll want some ss lines with good fluid and pads.
PSS - Oh yeah, a driving school would be a real good idea too.