No problem, enjoy the hobby!
+1! If you set a schedule and stick to it, regardless of tank conditions you risk changing too much or too little and wasting water or hurting your tank.
This was my question also... If it's fully cycled, ammonia converted to nitrite, which converted to nitrate. You should have nitrates. I'd let it cycle some more.
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I saw the same thing with my new aquarium (around 150g total volume). The large water volume, combined with the fact that the API tests don't really start to read until after 5ppm, make it really hard to see nitrates unless you have added a very large amount of ammonia (which I did, and still haven't added fish).
I have never recorded any nitrates in my tank, from day one to now which is almost 2 years later (which makes my coral very unhappy). If you have good quality, porous live rock and are not overstocked, your nitrates will/can be converted into nitrogen gas.
Very few of us have DSB's or the right type of live rock to effectively convert nitrates to nitrogen gas. Most of us either remove nitrates via water changes, harvesting algae, or through the skimmer.
