We sell a few bulls & have been for several years. It takes a good while to build a good bull clientele, but there are ways to market cattle while you do that. A lot of bull buyers in our area want to turn a bull out with cows the day they take him home, which makes it difficult to market calves at a young age. It also makes it difficult to get what they're worth at a younger age!
If the calf is good enough to keep, I suggest you look at consignment sales in your area or maybe a performance testing station. Those options would help you by bringing the buyers to you. Consignment sales can be tricky...it'll be some extra feed & work to have him ready & presentable, and be prepared for a commission off the top regardless of where you go with him. A test station is a good option because you take a calf, they feed and develop him, and then sell him at the end. It can be pricey, though, and not every bull that goes in makes the sale, so understand the requirements on the front end.
Selling private treaty off the farm is your other option, and most of us do at least some of that. It's part of the "sales and marketing" job description you agree to when you decide to raise purebred seedstock! Look for logical places to run inexpensive classified ads and see what happens. And be prepared to stand behind him...I suggest you get famiar with the ASA's Recommended Sales Guidelines...you can
find those on the breed association website.
Good luck!