The biggest cause of pearling is not being in the proper space on your board; i.e. being too far foward when you are laying flat on it.
Typically, and I say typically with a grain of salt, when laying flat on your board, and you put the nose of your face to the board, the logo ends up being right in front of your eyes.
like on these Lost boards:
http://www.lostenterprises.com/prod/06MRboards.php
Your eyes should be in the middle / top end of that MR logo.
Now, that's just a guide, but then while you're paddling, the very tip of your board should be up out of the water, not dipping down into (too far forward), and not sticking a couple inches out (too far back).
Popping up... everyone ends up with their own style. Supposively, you're not supposed to grab the rails to pop up, but place your hands on the board.. I grab the rails. Some people go up on a back knee and pull their body from there. But in the end, you should get both your feet on the board at the same time for best perforance and balance.
As for timing.. there is no 'second count'. It's all feel. Once you feel that motion, you know when... the wave has you, and you can feel it. If you don't get up, it's either going to pass you through or you're going to body board the drop before being able to have the opportunity to stand again. But, hey - if you're learning when to stand.. body board it and then stand.. then start playing with the timing and feel.