Getting an unexpected rooster is a real risk and preparation for this is very important. The only three options you have for this is to keep him, butcher him, or re-home him. If you would like to keep him and reduce the noise, you could try getting a No Crow Rooster Collar. They will help reduce the noise by about 70%. If you do not want to butcher him yourself, try contacting a local butcher shop. If you are going to re-home, there are several places to check with 4H, FFA, college agriculture dept., a college science department, feed stores, local farms, animal shelters, Facebook, Craigslist, or local newspapers. These are not all the options that you can use, but they are a start.