Unfortunately ferrari355fi, the above advice is all sound and comes from guys with a lots of experience with cars.
Fixing and modifying cars is a great thing to do with your time, but you've first got to set realistic goals. There are gonna be a lot of things that don't work out first time you try them, things will break, pistons will get stuck down bores, bolts will shear-off, etc, etc. Most of all, YOU WILL ALWAYS FIND MORE THINGS TO FIX THAN YOU EVER THOUGHT.
My suggestion is GET a car to do work on, but make it a fairly basic one -eg 4-cyl, 2WD, no fancy electronics. (Even a GT4 has got twice as many pistons, valves, camshafts, belts, bearings, seals, etc, etc than most basic cars). There are lots of great starter cars from the 70's & 80's that are real goers, cheap to buy & will make a great project. Work on it over time & enjoy yourself & the fact that YOU are making this car go faster & handle better than it ever did before.
Make a Ferrari a longer-term goal. After doing your first project car you will be so much more knowledgeable about taking on & restoring a Ferrari. Lots of Ferrari owners (or other exotic makes) have more than 1 car, and many would have another cheap project car just for working on.