Greetings moto guy!
The best time to discover the facts about cycling a tank is BEFORE you set it up. I guess that we are all "winging it" to some degree, but "winging it" right "out of the chute" does not normally lead to success in this hobby. I say all of this because I sense that you may not have done much in the way of research, and I want you to succeed!
If you will read up on cycling a tank, I believe that you will find that nitrites is part of that cycling process. It is true that AFTER your tank is cycled you DO NOT want nitrites in your tank, but that is AFTER. This is now, and you will go through a brief period of nitrites, OR, your tank will not have cycled.
WETWEBMEDIA.com is a good place to go and search out information. And you can do searches on this site to find answers to common questions like "cycling a tank", as well. I recommend that you do your own research, and study, because ultimately, you are responsible for the care of any creatures that you house in your system. As much as we all want you to succeed, we may not be there at precisely the moment when you need the next critical bit of information. And even if we are, we may not be able to sort out any dilemmas that you are facing quickly enough to pull you through without loss. Randy Holmes-Farley has lots of articles on reef chemistry that you can find on the net, as well. Read all of them!
Having said all of that, if you are testing positive for nitrites (not you but your tank's water), I suspect that you will shortly go through a period where nitrates will develop, increase, and then wane as your system of rocks and sand build up bacteria that will consume, finally, all of them. That would indicate a completed cycle has occurred.
David