I always just add the sand, then rock, then saltwater (or just water then salt) then ghost feed flake or pellet food for a few days or add a dead shrimp from the grocery store or purchase a small quantity of "live rock"..
You can also dose pure ammonia without any surfactants (if in doubt you can purchase dr tim's ammonium chloride from Amazon,etc..) until you measure .5 to 1ppm of ammonia (some will say up to 2ppm.. IMO that is too much and just causes higher nitrate levels that you need to get rid of)
You can also dose "bacteria in a bottle" products per their instructions..
Lots of ways really.. None is really "better" than the other..
Unless you know the dry rock has issues with phosphates being bound in it (pukani rock,etc...) then I don't see the need to "cure" it outside of the display tank..
Most dry quarry rock is usually clean and phosphate free..
Expect 4-6 weeks (or more) for a dry rock tank to fully cycle but usually 4 is good provided you get it started with whatever method above..
You can also cycle using live critters (damsel fish,etc...) but thats kind of frowned upon now..