Side rant: Why don't people use downslopes? That looks so hack when people jump to flat. Nothing looks sweeter than clearing a huge gap, and hitting the landing so perfect that you don't even bottom out. And, that way, you can do it all day without shattering suspension parts (provided your landing is steep enough for your take off).
for flips ya gotta have the right jump and a flip is controlled with breaking and accilerating in the air. Theres plenty of vids of flips in the video section