1. Turbo Manifold
2. Turbo
3. Downpipe
4. Chargepipe (from turbo to throttle body)
5. A bunch of check-valves (yes I know it's ghetto, but it works!)
6. Fuel Pressure Regulator
(these are optional)
7. Air Filter or Pantyhose
8. Intercooler
9. External wastegate
10. Blow-Off valve
11. Larger Injectors
12. Bigger Fuel Pump
13. Gauges (i.e. Boost, Air/Fuel, etc...)
14. Lots of T-Fittings for the check-valves (Petco or any other pet stores are a great place to find 'em cheap!)
I can't think of anything else yo. But focus on the first 3 or 4 items, worry about the piping and all that other sh*t laters. Good luck playa!