Step One: Obtain medical insurance.
Start with a table top jump, not a gap jump.
Keep the throttle steady, don't blip it and DO NOT LET OFF.
Keep loose and relaxed, but don't let go!
Don't go for height, don't "preload"
Just go for a smooth straight clean jump with only enough air to make the landing.
Flat landing = rear wheels first, punch the throttle right before you land, and keep it on.
Sloped landing = all four touch at the same time if possible (the front end will be "downward"), also, use throttle right as you land.
As you approach the face of the jump, keep a steady speed and just "ride over it". Do not let off the throttle do not wick the throttle. Lean back slightly so you feel your weight pulling back against the handlebars (not too much). Right as you land, give more throttle, but not WFO.