Welcome to the forum. I have a '65 2 dr hardtop that I'm building a 390 for right now. There is good support from the restoration companies for reproduction parts for '65s and it gets better with time. Check out Dearborn Classics, Mac's Auto Parts, AutoKrafters to name a few.

In general you begin with mechanical restoration of the driveline, brakes, suspension, etc then move on to body and interior once you have the heavy mechanical part done.

Is the car going to stay on the road as you restore it? This matters because it effects the level of detail you are able to give to each job. Having it running by Monday becomes a real pain after a while. I did it for years and now I can finally pull the car apart and do it right.

The best advice I can give you is to have at least a rough plan and some goals before tearing into it and be realistic about budgeting the work. I generally make a detailed estimate of what the job will cost and then DOUBLE it to get a 'real' cost...it is ALWAYS more expensive and complicated than you think it will be.

Tell us more about the car, your level of experience and what kind of restoration you intend to do. There are a lot of knowledgable and nice people on this forum to help.