sat for 2 years outside. what needs done first?

I got a 79 KZ 1000 LTD the other day that ran when it was parked but sat outside for 2 years. What do I need to check first. Never had a bike that sat any time outside and I don't have a lot of mechanical knowledge besides basic maintenance.

Not necessarily what needs to be done first, you need to do a bunch of things: change the oil and filter, squirt oil down the cylinders and turn the engine over with the kicker, slowly, a few times. Install new plugs, clean carbs, remove air filter and look for mouse nests, same with the exhaust. Lube cables. Unplug all the terminals, clean them and spray down with WD40 then use some dielectric grease. New battery (yes you need it to run properly) and you should be able to start it up. Iwouldn't even try running the bike without doing all those things thoroughly. It will save time later on if it's not running right, you can cross all that stuff off the list.

Anything after that is all chassis: tires, service suspension and swingarm pivot, etc.