To be successful, you will need a high level of skill and talent in your chosen art form.
If you are exceptionally talented you may be able to sell your work without formal training or qualifications. However, most fine artists have some training in art or design.
You will need to network and sell your work – you can either do this yourself or use an agent. If you sell your own work you keep all the money gained from the sale, but you may be restricting yourself if you have a lack of contacts. An agent may give you access to more potential buyers, but they will take commission from sales.
The Society of Artists Agents has details of agents and examples of artists' work, which will give you an idea of the standards of commercial work in demand.
You could also set up your own website to showcase your work.
Visit a-n The Artists Information Company for advice and resources on all aspects of working in the visual arts – you will need to subscribe to use some of the resources.
The Writers and Artists Yearbook also has advice and useful links for artists.