Hi man welcome to the site, as frank said the engine block and head will be covered by the K10 workshop manual or a haynes manual, the only thing you have to learn about is the turbo , loom and inlet manifold, not much in it. As regards parts this is the site i have been buying parts for figaros they have a lot of stuff on there, and guides etc.
http://www.gjnorthall.com/
If not done before you purchased the fig probably needs a huge overhaul, I would recommend timing belt kit including water pump, plugs ( NGK BKR6E ), plugs leads and rotor arm.Air Filter oil filter etc. If you have problems starting it cold you will need a cold start valve. Shocks could need to changed also
Hope that helps
