Wow, nice truck! That's a good deal too, if it runs and drives. Congrats.
I bought a 99 2dr Tahoe last October. I've cussed at it. I've busted a lot of knuckles on it. I've rebuilt all the front end suspension, put in a lower manifold gasket to fix a nasty and well - documented leak, had various electrical issues and creaks and vibrations that I can't identify.
You know what? I'd do it all over again because this truck is freaking awesome and fun to drive.
My wife is convinced it's a mid-life crisis. Whatever. I'm happy. ☺
Just relax and enjoy your new ride without over thinking it. You'll be working on it for certain, just accept that, but it'll be a labor of love.