Here's another link that helped me finally understand cycling. It gives really, really step-by-step clear, exact how-to instructions:
And, if you don't want to do a cycle, you can purchase some of the "cycle in a bottle" products. These get mixed reviews, but I've had really good luck in all my tanks with the API Quick Start, and I've read that the Dr. Tim's product is good as well.
If you use the Quick Start, just leave the fish in for a few days/a week, until the ammonia gets to 0.25 (when you'd normally do a water change). At that point, put in the Quick Start following the package directions, and test every day to make sure that the ammonia is going down, and that nitrates are going up.
One note about the Quick Start, buy whatever size bottle you need for immediate use. Open it, use it, then toss it. For whatever reason after the bottle has been open for about 24-48 hours, the BB's inside have died...or something, because it's no longer effective and won't cycle your tank. So keeping it around after opening is pointless as it won't do anything for you. :)
I hope that helps!! :D