By testing nitrite and nitrate you'll be able to see where in the cycle you are.
Ammonia spike
ammonia starts to drop, nitrite spikes
ammonia to zero, nitrites drop, nitrates appear
ammonia zero, nitrites to zero, nitrates go up
ammonia zero, nitrites zero, nitrates up and maintaining - cycle complete
And the regular water changes after that eliminate the nitrate
or at least keep it in control.
I have seen some great graphs of this cycle on line - but I can't remember where. If I run into them I'll let you know.