Hi @Water world
If you've not added something to rot (e.g. fish food) or a fish, then there will be no ammonia for the bacteria to work on, so a zero reading would be expected.
Are you planning to do a fishless cycle, or fish-in ?
If you're doing fishless, then you can get some ammonium chloride
or add some fish food until you get an ammonia reading of 1-2ppm. Then go through the normal cycle routine, waiting for ammonia and nitrite to go to zero then eventually you should have nitrate.
Or if you're doing fish-in, I would recommend adding ATM Colony to the tank. I know your rock has bacteria spores, but in my experience they weren't quite sufficient to get the cycle going on their own. ATM Colony will do it though.
In either case I would test the day before you add the ammonia source (food or fish) then daily after that.