horsemen:
i should get or be doing to help me in the call and in the pool. like how far do we need to beable to swim top/under water do i need to be able to hold my breath for a certain amount of time ect.....
We need to know the name of your certifying agency to give you more details. PADI, SSI, NAUI, etc. Most of them require a swim test to gauge your comfortability in the water, which will include some or all of the following:
Unaided, untimed swim: This is usually anywhere from 200 - 500 yards/meters, or about 8-12 pool lengths. You can't use any aids such as snorkle, fins, or wetsuit but sometimes they allow goggles or a mask. It's untimed and you can use any stroke or combination usually.
Tread water: This is usually 10-20 minutes of just staying afloat. Some places require you to keep your hands out of the water, so you're basically just using your feet.
Underwater swim: This seems to be fairly rare, and you more than likely won't have to use it. It's usually a fairly short distance like 50 - 75 feet.
In the mean time, go ahead and purchase your books/video/materials (or receive with course payment) and start reading.
PS: There aren't any "hold your breath" skills. Holding your breath is the one thing you NEVER do while scuba diving, and you'll learn why later. Good luck.