OHHH you need some books!
a true cycle is when you get an ammonia spike in your aquarium and then, due to the live rock and your filtration it balances itself back out.. kinda like the ocean after a large storm.. everything dead gets dredged up and smells bad for a few days but then goes back to normal.. this is what needs to happen to your tank/rock/sand before you add fish..
If you plan and pre-cycling your rock/sand/water before you get the tank you need to put something in the tank that will cause the ammonia to spike and the beneficial bacteria to get to work to even it all back out, we call that ghost feeding.. You would put a piece of bay shrimp or a portion of raw shrimp or a bit of flake food..
If you are doing this in the trash can.. you will need to do partial water changes every 3 days or so.. you may also want to have some kind of light set up to mimic daylight so that the beneficial bacteria has a chance to help..and it will SMELL but that lets you know that it is going...