Don't use fish to speed up the cycle. Either go natural with a piece of shrimp or use bacteria in a bottle.
Test your ammonia, all you need I worry about at the start. Once you see it register, spike, then start to go down check for nitrite. Once it goes through the same up and down, start checking for nitrate. Once nitrite is 0, you can do a large water change and get your clean up crew ordered and added.
I have never worried about water changes during the cycle. Why waste the salt just to remove the ammonia you want to start the bacteria process with?