Before you 360 make sheer you can 180 both right and left. Make sheer you go up to the jump or hip with full confidence that you will land it. Approach the jump with a enough speed to clear the jump and your feet shoulder with apart. Right when you about to hit the top curl your arms back and fling them.
Step 1: In the Air
Once you flung your arms back and flung them and you in the air look at you back ski and keep turning till you do a full 360.
Step 2: Landing 360's
When you land make sheer you front tips aren't diving into the snow, so lean a little back to not do that. Lean with your feet shoulder with apart. And then ride out
Step 3: Try It!!!!!!
Good luck and keep on trying. Remember you have to commit.