Agree with rabbut. Since the Homebase ammonia tells you its 9.5%, you can go ahead and dose per rabbuts calcs without even testing and the amount should be a close enough to be fine. There will be some tiny number of the correct species of "ammonia oxidizing bacteria" in the tank (where there's water there's bacteria!) and you will be giving them some ammonia to eat and the Fluval 2+ will be pumping water with fresh oxygen over the filter media where these few bacteria will prefer to attach, start eating and start building their "biofilm" structures.
Get your test kit as soon as possible so you'll be able to know when these "ammonia oxidizing bacteria" (we sometimes call them "A-Bacs" for short) have multiplied enough to noticably reduce the amount of ammonia in the tank. There are two things necessary before you re-dose the next 5ppm of ammonia: First, the tested amount of ammonia has to have dropped to zero ppm. Second, the rough time-of-day has to have come back around do that period of the day when you will always add ammonia. Most people establish either the morning or evening as their "add time" and the reason for doing this at all is because later you will want to note the time and then be able to check again 12 hours later (so doing in the evening lets you do your 12-hour check in the morning or vice-versa, make sense?)
Once you've got your test kit you should post up both your tap water results and your tank water results. Many find that re-reading the "rdd1952" pinned article on fishless cycling add and wait method several times is very helpful. They can then formulate questions to post here in their thread.
~~waterdrop~~