Hi Steve
If you want to use the minimum number of grit stages then make sure you read Mel Bartel's guide to mirror making. That's the way he works:
https://www.bbastrodesigns.com/JoyOf...ing/Intro.html
I would also suggest you read through the stellafane site. Here is a link to their section on grit:
https://stellafane.org/tm/atm/mirror-refs/grit.html
I purchased my grit from
gotgrit.com
You use silicone carbide for the first 2 to 3 grades of grinding then switch to aluminium oxide if you can. It's smoother and quieter to work with.
Cerium oxide is used throughout the polishing and figuring process. Some people use rouge for the final stages but that's not essential.
You will also need some pitch or aculap to make a polishing lap.
Hope that helps,
Rod.