What exactly do i need

[thermal]

These are the minimum that I recommend. Shopping list for you;
-Exhaust Manifold
-Turbo (T3, TDO4, TDO5, T25, T28, T3/T4 if you want higher boost potential)
-Wastegate (unless internal wastegate is already provided)
-Intercooler
-Piping
-BOV
-Oil lines (supply and return)
-T fitting and coupling for the oil lines
-Various vacuum lines and vacuum T's
-Possibly a boost controller (manual will be fine.... check out: www.boostvalve.com )
-boost dependent FMU or an electronic fuel enrichment device
-Turbo timer
-Boost gauge

There is more to it that this man. Keep doing research. Also, ask specific question vice general like this. I have a lot of custom turbo info for you. You can even use an 88-91 CRX/Civic pre-cat exhaust header as your exhaust manifold with a customized plate. Plan to spend money even with a custom project. Do not get too cheap especially with fuel enrichment...... Peace