I started out just doing it in first and not shifting, then I moved up to second. When I could hold it a LONG time in each gear I started practicing shifting. It is just so hard to demonstrate over the net I would just confuse you if I tried to say anymore.
For tricks, my first one was standing on the grab bar and taking one foot off. My next one I would take one hand off and wave, then I combined the 2 tricks. Then I did bumper grabs, one footed bumper grabs, then a bumper grab with my right foot on the left peg on my left foot on the grab bar. Now I do tricks sitting down. I put my feet over the bars, I only use one hand sitting down, and blah blah blah blah blah.
Once you get your basic balance down, you will try to push yourself to the edge of balancing by doing other tricks. Just let your imagination go wild. You'll learn. I started out doing a 4 foot long wheelie and only hitting jumps and getting 1 foot of air. Now I can do a football field long wheelie with only 1 hand and can bust out no handed landers consistently.
Basically it is more of a practice thing. I have been riding ATV's since I was 4. Just go out, ball up, and go for it.
Honda 250EX:
-Baffle Taken Out of Pipe
-20" Rear Razrs
-21" Front Razrs
-+3" Spacer Kit
-Frame Skid Plate
Honda 300 TW:
-Moose Floorboards
-Moose Handlebars
-25" Dirt Devil Rears
-Wide Mud Flaps