You should have sand,water,and rock in the tank to begin your cycle. If you cycle a tank then add any of the three you will start a new cycle after adding..
Good luck on your new hobby and welcome.
Your question tells me you do not know what cycling is. So why don't you do yourself a favor and read about it. This is not a cheap hobby and you can save yourself a lot of money and greif if you first read. There is plenty here to help you and then your questions will be more meaningfull.