Mopeds are so insanely simple to work on and the best attitude is to just tear into parts and see what happens. I knew nothing about mopeds when i was 15 and now through trial and error i can do most work with my eyes closed.
There were no tutorials online back then but a service manual (which i bet there is for your tomos) and just doing it will get you a long way.
If you need 4 more topics to replace the springs in your brake, mopeds might not be for you. (edited)