First, I suggest you talk to your coach. You will need them to spot portions of what you are doing if you feel uncomfy at any point.
My development is this, all on the low bar:
*learn sole circle
*learn late drop in sole circle (jump to a tight arch, stoop in)
Place a crash mat or 2-3 8" mats about 2-3 feet from the bar facing out (away from the high bar).
*learn to shoot to a stand (basically, a sole circle to pop off to standing).
*shoot to stand punch dive roll.
* shoot to stand punch front
* raise mats another 8", repeat.
* go to a pit, try one. If no pit is available, drill the previous steps till you're sick of it, then try one from the high bar into a porta-pit with spot.
Now, that's just my progression. Please talk to your coach, and coinsider their approach as well. I suggest that you learn a 1/2 out as it is easier to land, safer on your knees, and adds flair to the dismount as a whole.
Good luck, and be safe! Again, talk to your coach!
Ryan