Selling Your Web Development Skill
You may have a unique skill as web developer and do web design as a hobby. Many don't know how to sell this skill to earn extra income. Let alone run it as a business.
Or some tried to do this business, got clients, and then could not cope with demanding job. They could not respond to ever-changing client's needs.
Special Skill
You need to focus on what area you want to build. Currently web development is already complex. Even basic static page development requires extensive knowledge about different codes like HTML, XHTML, CSS. This can be extended to copywriting and search engine optimization.
There is also a development in syndicating content so that your webpages can be on the show in other websites. It is like television channel in your cable network. Or it is like newspaper content where newspaper can subscribe to news office and print them in their daily publication. RSS-XML is used as technology behind this syndication.
Advance skill can fall into database and multimedia. Amid complex databases and programming languages, you may have to choose which one to focus. Of course over time you can build your skill to understand other language/databases.
Another league of web development is multimedia folk. They play with graphics, audio, video, streaming, etc.
Of course you have to master how to upload file to web hosting and how to use various tools and software. You can learn this as you go.
Getting In Business
Know your potential customers first. Evaluate which type of customers to start with. If you have worked for major corporations and know some people in this network, try to keep in touch with them. Find out what you can offer to help their businesses through web development.
You can also start from other end if you don't have exclusive corporation list. Try to work with other larger agency which provides web development service to its customers. Their staffs might be stretch-thinned and need your help! Find out more about starting and running this web business in Fabjob Guide To Becoming A Web Developer
Learn more about different resources in the web for both skill development and marketing in that ebook. Pay attention on how to write a proposal, setup a contract, and be successful.