Full overhaul.
New cables and housing.
New tires(pasela) and bar tape.
Remove everything, clean and degrease all components and frame, then grease bearing points and rebuild the bike.
Adjust and tune so everything works as it should.
$60 for the tires, tape, and cabling.
3-6 total hours of work spread over however many days you need.
Itll be an awesome looking vintage period correct looking bike.
Sell anywhere between $230 and 350 depending on where you are and on which platform its sold.