well, if you are riding only in sand, then a paddle tire would be optimal. starting off in sand, with a dirt tire, while learning to ride, is very difficult.
while you are riding, you want to keep a steady speed. you don't have to go 60mph to stay afloat, but you definitely want to stay out of first gear. when turning in sand, if you turn to hard to slow, you're going to wash out. the solution? make wider turns, and possibly faster.
when going up a hill in sand, get your speed up before you ascend, so its more momentum than engine power getting you up. if you stop halfway up a hill, you probably aren't going to make it the rest of the way up.
when jumping in sand, you want to land with the throttle on, the rear wheel is going to drag alot.
be careful with the front brake in the sand, if you hit it too hard, then the front wheel will wash out.
lastly, practice. if nobody told you these things, you would have learned them from experience. you can ask as many questions online as you want, but there is no good substitute for seat time.
well, i hope this helped- chris