Go to Signpost. Signposts offers interactive learning. For example, you can input a letter or word and a corresponding finger spelling is shown for you to imitate. The site features one the most comprehensive collections of learning resources of BSL.
Use BritishSign. This site provides a variety of free materials including finger alphabets and useful day-to-day signs for weather, colors and school. You may also enroll in one of their online courses. Course topics include basic introductions, greetings, family, descriptions, time, money, hobbies, food and drink. If you would like a more comprehensive course then you can sign up for their ultimate beginners package -- a CD-ROM set that costs about $75, as of 2011.
Go to DeafSign. This site offers basic signs. It also gives you some basic building blocks for for signing, such as how to hold and move your hands. The site also offers some useful tools for learning BSL ,such as an iPhone application, posters, flash cards, a dictionary, a signing book and some games. The site also has a forum in case you would like to meet other people who are learning BSL.