1) What parts do I need?
The engine, poss the whole fuel system (is yous a 16 v?)
Does the engine fit easy (DO I need to make any special modification)
Yes, swap the flywheel. Use mk2 16v exhaust manifold and d/p.
How long will it take if I will do it in my GARAGE?
When you say GARAGE, do you mean GARAGE or garage, if you mean garage, how long is a piece of string?

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Will the Supercharger fit?
Any thing will fit with time, money and effort. Good luck, Steve.