Collectors can only place bids at or above your reserve price. Once the first bid gets placed a 24-hour timed auction will begin. All subsequent bids will need to exceed the current bid by 10% or 0.1 ETH, whichever of the two is lesser.
During this time, you can build excitement for your auction through social media to encourage more bids.
If a collector places a bid at the reserve price, and there are no other bids, the piece will sell to the original bidder.