Should be in repairs and technical.
First all, it's a Polyurethane finish. Second of all, there's quite a bit about sanding should you want to do a search on this forum. I'm not going to repeat what has been said in this post because there's far too much information to convey from people who are much more experienced than I am.
Suffice to say, Poly is simplistic to remove but takes a lot of time. Electric hand sander will work fine until such time when you go to awkward bits and finishing, when you'll need to do it by hand, take your time, start with low grit such as 40 or 80, then progressively move up towards 1000 or 1500 when you've removed the poly and are just finishing the body to make it super smooth.
As for getting it refinished. Either a car body shop or a luthier will be able to do it properly for a flawless coat. Finishing by hand is possible with laquer, takes a long time of applying, drying, sanding down and even, reapplying, waiting, sanding down again, etc..... until you need to buff the finish into a high shine.
[b]Seriously though, go do a search, and considering you've just joined today, go post an introduction thread in the introductions section of the forum.[/b]