I love mine, my grandpa left it behind 16 years ago, it sat for 15 years as my dad rode it for a year, it looks like the bike is in great shape from what I see in the picture. If it has been garage stored I expect you will have nice bike.
I had to pull off carbs and clean all the passage ways with carb cleaner, and yes it took about 3 times of removing off bike until I got it to the point it would at least stay running. It's a learning experience and there are tricks you will find. I had messed up stuff along the way and have had to replaceman parts due to learning.
I changed my tires as well as rubber that has sat that long probably not worth it. Obviously will need a new battery
All things you may be able to get bike for alittle less but at 1000 that could be fair if it was well maintained up until it sat
You will need a rad flush, probably valve clearance adjustment, would do the valve covers at same time. this site offers so much help in doing your project, there are many good fellows on here also that are willing to help out and can give you good advice. He bike runs great and I couldnt have gotten to where I am today with it without this site, he air suspension feels nice, bike rides so smooth and for a heavier bike very easy to ride. Has lots of power too, it's to bad you can't test drive it to see how great this bike really is