I am learning to treadle also. I started with no thread or needle in the machine and would just sit down and try to get the machine going forward. I didn't know at first you use the hand wheel pull towards you to get started the right direction.
I would practice starting and going various speeds and stopping. Stopping is the hardest I think. But you will get the feel of where the wheel will stop.
If you go backwards the thread breaks.
Then when felt more comfortable, added needle, thread and fabric.
Nothing more to it.
Others have more experience since they do not use electric machines. I am sure they will jump in.
Look forward to seeing your creations.