This list is entierly subjective but it should give you an idea of what tricks to learn in which order.
Only once you learned a trick in all slots, reverse, palm down/palm normal
(if possible), you have mastered it.
Learning tricks in reverse and in all slots is VERY important!!! If you
only learn the Trick in one slot, you will have problems making combos!
Try to learn every trick in all slots and in all slots reverse!
For example: You just learned "Sonic 23-12": now try to learn "Sonic reverse 12-23", "Sonic 34-23", "Sonic Reverse 23-34" (recommended order). This works for almost all tricks.