Here's a list with some ideas with where to get some parts, there's probably some more bits you'll need. I've only turbo'd a d-series so not sure if you'll need any special parts for them but it's mostly fairly universal.

Manifold
Turbo
Dump Pipe and Exhaust (Custom)
New Gaskets
Intercooler
Intercooler pipes
Pod Filter
Bov (Not a necessity)
Injectors
Oil lines (Braided line)
Sump Mods for Oil Return (Weld in a AN fitting)
Oil Catch Tank (Moroso Dry sump breather tank 85473) I got mine from Rocket Ind. but with the dollar the way it is you could probably get it from Summit or some where similar.
Water lines (Earls Superstock or similar) E bay or Horsepowerinabox
Boost Gauge
Boost Control (Turbosmart Boost Tee or E-boost street)
Computer (Hondata)
MAP Sensor (3 Bar Sensor) Not a necessity I don't think depending on the level of boost you run.

That's all I can think of atm. A few things you will most likely want afterwards are a LSD, and an oil cooler if your planning on tracking it.

Luke