If your goal is to maintain your already shave-ready blade(s), stick with the 12k, if you really want to go down the rabbit hole with honing and stones, get a tried and true progression of stones. You have the 1k, as others have said, you will need at least 2 more intermediate grits. When I first started honing, I had taken edges that were maybe a little too far gone for a simple refresh on the 12k all the way down to the 1k, then up the grits, and never achieved a shave-ready edge... It opens Pandora's box... If you can make due with the 12k for now, wait until you can get the proper setup before you go down that road. It's ultimately worth it to know you can do it all yourself, but you'll be glad that you have all the right tools when you start.