welcome to fishlore!
they aquarium nitrgen cycle is when
ammonia is created by the fish, and are turned into nitites, and then nitrates, which is much less toxic for your fish. we dont reccommend cycling with fish, but many people do it, you just have to keep up the water changes, and this is going to take longer then without fish. make sure you dont add any more fish until the tank is cycled, and i would recoment buying an
API Freshwater Master
test kit. Make sure u do at least 25% weekly water changes until the tank is cycled.
more people will chime in with there thoughts soon!