If you really want to make your RPG and dont fancy the easier tasks such as pong then maybe just break the project down.
Task 1: Make a demo walks over a matrix
Task 2: Make a demo where you load trees onto a matrix
Task 3: Modify your first demo so that its a model of a person rather than a sphere. Try to have it animated walking.
Take small steps at a time, they dont have to be complete games but you can learn things that can help you later.
If you need more ideas for small tasks or hints to make any of them I have listed then just ask.
Good Luck