First, buy good pads and a helmet.
Second, learn to knee slide. Run up the tranny (from flat) and knee slide back down. Next drop-in to a knee slide from the coping. Learning to fall/knee slide is super important on tranny if you are just starting. Running out bails is some next-level stuff. That will come with time. Pads are always a good insurance policy for a failed run-out, too.
Third, follow what others said about pumping the tranny, kickturns, etc. Start small, and work your way up.