quarantine tank question

[Baldy]

I am coming up to the point where I'm about to make my first fish purchase. have decided to set up a quarantine tank with an empty 10 gal that I have with a heater, powerhead, and hob filter. I will use water from the main tank to fill the qt and let the filter sit in the main tank for a while to establish more bacteria for the qt tank. my question is, am I going to need live rock in there as well? I have no sump that I can take rock from and replace later, and i would prefer not to take rock from the main tank each time i set up a qt tank. The same goes for sand as well. Will i be ok without rock or sand in a qt tank?