@db4690 wrote a list of what NEEDS to be done. It’s likely you will start to drive the car as soon as you can, but these fluid changes are really critical to not only getting it running, but also keeping it running. The hardest is changing out the gas, and getting rid of the old gas is a problem. If you live in a place with environmental laws there is some place where you can dispose of it properly. Just start asking around.
If you do start driving it, at least at first take it easy and expect something bad to happen. The first 50 miles or so stay away from other cars if you can, drive when there’s no traffic, drive alone, expect terrible failures, and bring a cell phone and a toolbox. The brakes might be OK, but they might fail. The tires are old and the tread gets very hard and slippery, and they are prone to blowouts and sudden failure. Wiggle the tire valve stems pretty hard because they get old and crack and then can suddenly just break off and you can lose control of the car. If the car shows signs of becoming reliable (starts easily, idles well, nothing is leaking or knocking or banging around) then invest in new tires and new flexible brake lines.
The zebra striped seat covers and fuzzy dice come later.