Aaaww how exciting! I agree with Harmony, get it fixed as young as your vet will do it. I had my boys done at 5 1/2 months old, before the male hormones had chnace to kick in and they started spraying and getting agressive with each other. Important as they are indoor cats.
Oh I'm so jealous, kittenhood is the most fun (and testing) time! Say goodbye to your curtains, and post lots of pics!