No offense but if you need to ask about general then restoring will be over your head as a start.
Pick up something semi running or in just of need of a new XZY and work your way up.
I don't mean to turn you off but in your shoes people tacking something like a restore will leave you giving up 99% of the time no matter how much you enjoy it.
But to help you more, some good things is pick a project. Read about it non stop. Read about things related to it. Get books on that car. Get books on that configuration of motor (a lot of classics have special books just for minor year changes etc) Then get some entry level how too books.
I've done countless motor swaps, now I can bang replacing motors on most cars out in an afternoon kinda drunk. But I started small, and when I only had one car many times I wound up crippling my self. I still can not paint do body work or wire at all.
It's been well worth it.
Any ideas what you'd be thinking of restoring? I love classics and know a lot of them pretty well.