I should show you the 0-6-0 I did for OGR. Myron did not like it - it stalled on his switches (one roller) and didn't have smoke or lights.
I don't normally do 3-rail, so did not realize what was really important. The model remains 3-rail to this day, although I may have robbed the motor for some other project.
But if you want to hone your skills, do what the poster above suggests - start with a Williams! Start small, and get a switcher - the B6sb is down to $150, and worth every penny. The Mikados rarely bring $300, and they too are quite nice!