You should go to you tube and search "wallflip".  There's ten billion tutorials on there about how to do it.  I'm trying to learn this move well also, and worked out a few of the more important bits...  Get some good speed going into it (don't full out sprint, but the more forward momentum you have, the more potential upward momentum you'll have), take the one step on ground, PUNCH the wall step at about chest high (or higher! the higher the step, the more air it seems...)

when watching the videos, pay attention to where each foot is placed, what the hands are doing, what the head is doing, and where the center of balance (a bit below the shoulders for guys) is, and when to start leaning back.

A spotter is a great idea if you're lucky!  If not, just try it and be willing to land on your face!