As with any answer to such a question as "when to start"...it depends. I myself could not imagine having enough presence of mind at 125 jumps to add 'yet another thing to think about' during a skydive. I'm sure you're going to do whatever you want regardless of what anyone tells you, so just remember to keep it simple. You'll easily become overwhelmed if you add too many factors into the equation at one time. If you're hard on equipment, you may want to look at cheaper cameras. But in the long run, you'll end up getting the quality gear you we're looking at in the first place. Just ask some camera flyers that have been around for awhile and I'm sure you'll quickly find that Sony is the choice for the majority. I personally have a Sony PC-3 mounted on the side of a Hawkeye. I am happy with it, but would rather have a top mounted camera (if it wasn't for the climbout hassles of jumping from a Cessna).