I can offer some advices here on the turtle since I'm already quite good on it (self-proclaimed... heheh). Anyway... place your elbows on the sides of your abs. You won't want to place them on your hip bones instead. It'll most likely hurt you. Besides, doesn't it sound rather ridiculous if bboys execute the turtles on the end of their hips?
My suggestion: download some clips on bboys doing the turtle. Observe (in every frame if you need to) how they alternate their hands. "Flying Steps - Breaking It Down" has Crazy-Be doing it.
Now, the action: I do my moves CCW, so you'll want to go down to the frog position, turning to your left. Place left hand on floor (with it place firmly on the side of your ab as well). Can you do handglides? You might want to do the same technique. Only your right arm is joined to your ab, too. No better words describe it: just alternate on your hands. For a start, you might want to try to lean to your left to get momentum. You'll most likely fall after two or three walks on your hands. But don't give up. Practice consistently and you'll learn & feel it. Took me a week with 10-15 minutes practice a day. If you put in more time and effort, you don't need to wait that long. Trust me.

"I like to let people talk, who like to talk, and it's easier to find out how full of shit... they are." - Jacky Chan, Rush Hour
"Sorry, I'm allergic to bull shit." - Will Smith, I, Robot