Any fuel that's in the boat is varnish by now; it'll need to be dumped and fresh installed.
A compression test is a good start. You'll also want to have a good look for rust/corrosion around all the water passages where you can. Pulling some water hoses for a look would be a good idea.
If you have one or can borrow one, a bore scope would be nice to take a peek inside the cylinders before the compression test. Depending on the exhaust on the boat, you might also pop a valve cover off to see how things look there. Corrosion? Condensation?
Before you firing it up for the first time, consider changing the oil. It'll be a pita with it thick and cold, but after sitting for 2 years, even shrink wrapped, it's bound to have some water in it from condensation.
Don
'01 22 Classic, 502/B1
And a bunch of other stuff
"If everything seems under control, you're just not going fast enough" - Mario Andretti