Well, I can do all those tricks except the Wave (never seen that one before, I'll definitely have to try that in the mirror
) and I can't describe them. I believe things like this are something that you're born with...little oddities in our DNA. Like double-jointedness, or an excessively scratchy voice. The best way I can describe these is to flex your tongue whilst thinking about the position you want to achieve. Also, using your fingers to mold your tongue might get you an idea of how you need to flex your tongue to shape it as such.