Souns lie you are having a good time fixing up the bike. I look forward to pics of this bad boy. =)

Kool stop for the brake pads.

Brake lever tightening bolt is behind the lever. Look straight at the lever pull down on it and look straight in and you will see a bolt or screw to tighten. Most likely it will be a slotted screw on that bike.

Teh seat post you can take care of the rust with some steel wool. The seat tube IDK without pics and even then I might not know either.