This tutorial seems quite good. Covers the basic and various useful UCT extension: https://webdocs.cs.ualberta.ca/~mmueller/courses/2014-AAAI-g...

However, the tutorial doesn't work towards a working implementation. I think you can verify your results against benchmark problems. There are a number of good implementations around:

UCT implementation with many MDP benchmark problems: https://github.com/bonetblai/mdp-engine

My favorite implementation. The code is quite easy to read: http://www0.cs.ucl.ac.uk/staff/D.Silver/web/Applications_fil...