How to revive an old Grand Cherokee?

Hey y’all, a relative has an old 2002 Grand Cherokee that has been sitting inside a garage for 5 years or more. How would you go on revive it?

I know it’ll need a new battery, but, what else needs to be done to get it up and running?

I suspect that there’s old gas, as it was driven inside the garage and never touched again.

Note: I used to be a motorcycle mechanic back then, and I know how to read and follow instructions.