Well youll first have to decide what kind of car youd like. When we first started my car it was just gonna be a car that I could get around in and work on. Now it is completely apart and at a body shop.
Also youll have to think about your budget and how much you can do yourself. Alot the stuff on my car I had to learn through mistakes because I had a very low budget mowing lawns.
Id start off by searching and looking for cars you like for ideas or look at others projects to see what they have done in there restoration.
Didnt see DatsunLovers post, that is a very good point. be prepared to
spend alot of time or money to get the car just rust free. In most cases it is easier to save up and buy a car someone else has already put there money into.
In general with mechanical or electrical problems you can just bolt on a new part if you want but with rust its not as easy.