Just to be clear since we're having communication problems...don't follow the fishless cycling guides if you currently have fish in the tank. How big is the tank and what do you have in there? You're first steps should be trying to get some good knowledge on the nitrogen cycle and how filtration works (good links from Roy), and try to stay on top of your testing and maintenance routine. The no3 levels you have after this short time would seem to show the water is not changed frequently enough, or the tank is highly overstocked.