as a fairly new saltwater aquarium person myself, i will add in some things in easy terms.
i was in your shoes just less than a year ago. i had no idea about the nitrogen cycle, bacteria, or anythign else. in fact, i would say i am still learning. nothing that has been said so far, is incorrect. with that said, you can definately slow down a bit with the testing. even with api, as it has been said, is inaccurate, but will give you something to at least go off of. i started with an API kit, and i understand that the .25 will be there quite a bit, so the only time i really use API is if im in a hurry, and just want to make sure i dont have a huge spike going on. with that said, the only thing i really test for now is nitrate, and i dont really do that all that much anymore. at most, i test once a week for nitrate.
at this point, you are cycled and ready for fish. now, if the ammonia showed a dark green, then i would probably be concerned, but you will see .25 frequently, as i did for many months, and sometimes still do.
with your nitrates, your nitrates are still ok, but you could do a 20% water change and get that down, and be good for the next 7 days.
once you introduce fish, the fish will tell you if there is a problem. you will see different actions that will let you know of water problems, like gasping for air, or sucking for air at the surface, but thats another topic....i wouldnt be concerned with anything like that.
i wouldnt say to not do regular tests, but save yourself the stress and do as needed. doing twice a day, will just cause you un-needed work and stress