Im not much older than you will, and Ive just launched my webdesign business. I think 14s a great age to be starting, and I wish I did because then I would be alot more experienced today. Im sure the laws in Australia and England would be pretty similar ( i may be wrong) regarding registration and tax, Over here unless you make over $5000 a year you are exempt from paying tax. Also It costs $200 i think to register a business name and then you have to wait for at least a month. A good way to get around this is to call the business your own name, because then you dont have to pay to register it. I think before you launch your business (or even get started) you should build a portfolio. ie. make at least 3 websites for free. As I learnt the hard way, unless you have a portfolio you will not be taken seriously by anyone, and most businesses will not want their webpage designed by you.