After I figure out how many drops of ammonia it takes to bring my ammonia level in my tank to 5ppm,
Yes this is correct.
You say that after the ammonia has spiked and dropped to zero and after the nitrite has spiked and dropped to zero, then do large water changes.
Yes, i usually do 1 90% water change. Others do a couple of 50% changes. the main thing here is to get the nitrates down as low as possible before adding in the fish as the nitrates will always continue to build up. They are one of the reasons to do regular water changes.
How do you know when nitrates are present. I can't seem to find a nitrate tester.
The master kit or early versions of it do not have a nitrate test included. The logic here is that if ammonia and nitrites are at 0 and have gone through the spike then there must be nitrates. so just do your water changes and all will be fine. But most people like to track the nitrate levels as the nitrite levels rise as it gives a better indication of exactly where you are in the cycle. The kits can be purchased individually and probably at the same place you got the master kit. The same company makes them as do other companies as well. Here in Canada they go for about $12 HTH