Having a website is helpful, especially if you are a breeder. It gives people a chance to look at the rabbits you have, rabbits for sale, a sales policy, show wins and other stuff you want to put on there like grooming and general care. It is also a good way for people to contact you.
Facebook is also helpful. You an setup a page for your rabbitry. Advertise on the page as well as groups. Groups can be more national angora groups or local breeder clubs.
You can try craigslist or other classifieds websites, but you do need to be careful as you can get some weird people there.
With angoras, you do need to be careful with who you sell to. Many people like the look of an angora, but have no clue or desire to care for the coat. This leads to totally matted rabbits. It can be a good idea for you to talk with people a lot and even offer to help them learn how to groom the rabbit. If they live close enough and you are able, you could offer to help groom the rabbit. Even a monthly good grooming and then sheering as needed.