RE: Jumping
EXACTLY! The best way to learn how to jump is to take your time - dont just go for all out speed. do moderate speed jumps that you can easily control and be comfortable with. the best way to jump is to make sure you stay on the throttle until the buggy is completely in the air (this will make the jump slightly nose high) then if your nose is pointing upward to much just tap the breaks or if it points toward the ground hit the gas. the goal is to land strait and nearly on all four wheels (but slightly toward the front OR rear wheels) Also actually turning the steering wheel can slightly change the direction of the buggy in the air - so you can straiten it up if it comes off sideways - but be sure not to land with the wheels turned as it will result in broken parts!
to sum up. try to land parallel to the jump and nearly on all four wheels. you can correctly the buggy by using gas, break, and steering.