If you want something not very good maybe? or a used deck I don’t think you’re going to find anything of much value for under 50 dollars
You really can’t just learn to longboard in a day or two maybe to physically ride a longboard yes, but longboarding is a constantly expanding thing you can always get better and I would argue that it’s not easy. Chec out the bustin maestro good commuter board.
Likely you’d want to sand it just enough to take the paint off the. Repaint I don’t think you should bother with scratches it’s inevitable
What’s your price range?
http://bustinboards.com check out the push series maestro’s and sportsters make good all around and commuter boards.