I think you might just be being a tad impatient. The cycling part can take a long time and the fact you now have nitrites is a good start. Does your tap water have nitrites too?
The bacteria that convert Ammonia to Nitrites tend to build up pretty quickly, it's the bacteria that convert Nitrites to Nitrates that took much longer when I recently did it.
To give you an idea, it took 28 days for my tank to cycle. So pretty much a month. Some people claim to have done it a bit quicker, some slower. It's just one of those things, be patient.
Another thing, I noticed that the Nitrites didn't go down steadily, they practically disappeared over night
![Smile (: (:](/styles/default/xenforo/vbSmilies/Normal/smile.gif)
D) and other people have said the same thing. It's nice when it happens.
It is WELL worth the wait. Very satisfying.