Q-factor is the distance your feet are out from the crank arm (don't know if that makes sense.) The length of the bolt on your pedal where it screws into the crank arm may be slightly longer or shorter on different pedals. Also, a triple is wider, i.e., your feet are out more from the bottom bracket. I am kind of sensitive to Q-factor, and really noticed a difference when I switched my bike from a double to a triple. I am more comfortable with a smaller Q-factor. I got used to it though, and it was not a problem. Also, when I switched my Keo pedals to Frogs, it looked like there was going to be a big difference, but there actually wasn't anything noticeable.

I say stick to the pedals you are familiar with for now. You can always switch later when you are more comfortable on the bike.