Dead stuff/waste -> ammonia -> nitrite (with the help of bacteria) -> nitrate (bacteria again) as you can see nitrate is the end result and least harmful of the 3 to fishys and as long as you have plenty of good bacteria only nitrate should be present in your tests. If after a cycle you get an ammonia spike somethings probably dead, followed shortly by lots of other deaths apparantly.
Your water changes are mostly to rid yourself of nitrate, using algae such as cheato can help absorb nitrates aswell.
cheers Sorgan that all makes sense and I sort of new that. I have cycle dyslexia
I could only do a small change maybe 10% as thats the only water mix I had, I will get some water tomorrow from LFS and do another change and see where we go from there and if water tests ok saturday night I may get something sunday!!!!!!!!!!!!!!!!!!!!!!!! yay!!!