For any photographer who has tried to sell landscape pictures, they know it can just as long to sell the picture, as it did to actually find and take the picture in the first place. Photo buyers, whether they are a gallery, editor of a magazine or private collector, have so many choices available to them that getting your picture to the top of pile requires effort. Once you find an avenue that works for your type of photography, stick to it, and see if you can replicate that sales model in other areas.
Set up your own website. You can do this through a number of different website providers that exist on the internet. One company that is solely built for photographers is PhotoShelter. Through this site, you can create your own site to upload your portfolio and start marketing to potential clients. You can have a free site, or pay one for on a monthly basis.
Register with Stock Photography sites. Stock photography sites such as Shutterstock and Istockphoto accept photos from professional and amateur photographers and sell them to a wide variety of clients. Typically, stock photography sites pay the photographer only a small amount of money, but by choosing not to be exclusive to one site, you can market your work to a greater number of potential buyers.
Set up a booth at a local craft/art show. For those just starting out, this is a good way to get as much exposure as possible. Setting up a display table or tent at a craft/art show will also allow potential clients to meet you. Some clients like to know a little bit about the photographer whose work they are buying. These shows will also give you the opportunity to meet other photographers and find out what they do to sell their pictures.
Display your work in local venues. Approach locally owned coffee shops and restaurants to see if you can display your work on their walls. You might have to offer a percentage of your sales to the business owner. This is another avenue for sales and a good way to get your name to specific groups of individuals.
Contact local galleries in your hometown, or if you are close to tourist areas, contact galleries or gift shops in those towns to inquire about leaving your work on consignment with them. Consignment is a process in which you and the store owner get paid if the work sells.