Hi Fishchick,
Welcome to FishLore!

I can't answer your first question about the rocks. I think I've seen it posted on the forum somewhere. If I see it, I'll throw the link your way.
The API master kit can be expensive, but well worth it. It looks confusing, but it's really not, heck, if i can do it, you can!
This is the cheapest I've seen it:
http://www.walmart.com/catalog/produ...uct_id=3635493
There may be others here that can recommend a less expensive one. Stay away from the strips, they are not accurate.
Here is a link explaining the nitrogen cycle:
http://www.fishlore.com/NitrogenCycle.htm
Please consider doing a fish less cycle. It will be less work for you and healthier for your fish.
Good luck with your tank, if after reading, you have any questions, just ask, the forum is full of wonderful people willing to help.