cold in mn

A coworker has an 84 gl 4wd 4speed wagon for sale super cheap. It has about 70,000 miles on it. It's been sitting in a garage since 1991. The car was parked due to personal, not mechanical reasons. He used to start it up and pull it out of the garage then pull it back in for space reasons. He stopped starting it up a few years ago when the battery died. Im going to look at it next week. What should I look at or test. I plan on bringing a battery some tools and a small can of gas. I would like to use it as a daily driver for a year or two. Thanks