Stoppie? 360? J. Stewart?

[theDSsucks]

I can't find anywhere, including the guide, how do you do a stoppie??50 ft?

Is there some secret to how to do the 360? Mine always end up as a tsunami.

Why do 2 backflips in a row not count as a trick combo that includes a backflip?

I'm past level 25. Where is JS? Must all other rides be same cc as my vehicle? Or must all rides, including mine, be 450cc, as i read in other post?

Sorry for the questions. Any help would be much appreciated.