First off, for all you newbies out there, if you can't already balance perfectly on the board, don't be jumping it. Just don't, you're not ready. By the time you get to this stage you should already know how to

stand on the board
push the board
skate in a straight-line
execute a hard-turn
stop the board
For those to whom this instruction seems trivial, let us continue.

Though it seems backwards, you'll need to learn your landings first. Try practicing these by way of acid drops off of a short curb. To do this, simply roll the board toward the edge of a curb at a moderate speed. When you get to the edge lift the front wheels a bit and keep rolling until you drop off. When you land, bend your knees and make sure you land your feet over the trucks. You can really get hurt if you're not prepared to land so know how to do this before continuing.