I started doing jumping and drops on platform pedals. It allowed me more confidence to try things because I knew I wouldn't be attached to my bike if something goes wrong. Once I got used to the movements, I went back to clipless so that I can apply my skills to something fun on the trail. The platforms really help with good form because you aren't relying on being clipped in. At least that's what worked best for me.
Good luck, it's so much fun once you get going (you might want to invest in some leg pads).
Enjoy!