Hi!
Well, we started trying straight off the pill and had no probs. I was told that the wait was just so you'd know what your "normal" cycle was so therefore when you ovulate, but that it didn't hurt to try sooner!
I think they are "ovulation predictor kits"
Before you start, perhaps get a blood test to make sure you have immunity for Rubella etc. Nothing else that I know of...
Good luck!