Cool beans! After the cycle, the fish, and the fun stuff- how often do you test?
you test as often as you need to, and as much as your time allows, to a point where you can get comfortable that during the days you are not testing, you are still confident that you have have no ammonia and nitrite. I know that's kind of a nebulous answer - but at its core, that's what really determines your frequency. There is no "golden rule" saying how frequent you need to test b/c at the end of the day, all that we are trying to accomplish is to make sure there's no ammonia/nitrite in the system. As you go thru it on your own you'll understand what i mean.
practically what that means could be something like - (again depends on what your comfort level is and how much free time you have) - first week, you test every day, then maybe on day 7 and you see the same results you are expecting, you'd feel comfortable skipping day 8 and day 9, then on day 10 you test again that the result is still what you expect, and that makes you even more comfortable of skipping more and more. then eventually your tank matures and you are confident that it will take care of the full cycle and you understands how nutrients run through your system and what can cause sudden spikes and when to test. my tank is 4 years old now and i only test ammonia/nitrite/nitrate when i have a sudden fish/snail die and i didn't take it out fast enough and left it rot in the tank. Last time i did that was 2 years ago. (i test a lot more frequently my other parameters like alk,ca,mg, no3, po4 for corals, but not amonia or cycle related params)
For you, things that could change the cycle during the early days and cause spikes coincides when you change your bioload - such as when you start feeding, or feeding more, or when you add new live stock, or when you add new rocks/sands etc.. so maybe when these things occur, go back to to daily testing until you get comfortable that the cycle is still working and stable. Dosing extra bacteria that coincides with these changes is often a good idea.