I don’t really know what I’m doing

Welcome to FABO, glad to have you aboard.
My advice to you is to get the car running and driving ASAP, doing the safety stuff first such as tires, brakes, suspension, etc.
Then you can plan on the further upgrades and do them as time and money allows.
Don't forget to buy a Factory Service Manual for your car, it will pay for itself 100 times over........