Welcome to the BB. There is plenty of information on the BB. I restored a '69 GTV several years ago at Vintage Customs. Some words of advice:
1. Have a clear and detailed plan of what you want for the restoration.
2. If you are having others do the work, expect to pay more than you have planned (it just happens - unforeseen problems do arise).
3. Consider farming out what you cannot do (i.e. body work, paint, etc.) and focus on what you can do to keep the costs down.
4. It may take longer that you anticipated to restore, so be patient. It will be worth it in the end.
I am sure others can chime in as well.
Start off with the best car you can afford (body-wise). This will be the biggest restoration expense.
'94 Spider Veloce CE, '69 GTV (fast road/ track day car)
'65 Giulia Super (project car), 1 '67 Giulia Super Parts Car