You also need to learn about how the Internet works - basic server administration, DNS, domain names, FTP, SSH, etc. Learn the difference between HTML, XHTML, XML, etc. Learn about different development platforms - PHP, ASP, Ruby on Rails, etc. - and databases, mySQL, MS SQL, MS Access, etc. Learn about basic search engine optimization, because that is a huge part of a good sales pitch. Learn about content management systems like Wordpress, Joomla, Drupal, CMS Made Simple and Magento Commerce. You don't have to be an expert in any of these fields - just know enough that someone can ask you basic questions and you can confidently answer them.
You need to have a good general knowledge of how the Internet works so you can actually sell services. The only difference between a company that gets $1000 for a job and one that gets $3000 can often times just be pure salesmanship.
On the design end, learn Photoshop. If you can create a nice web design in Photoshop - which is how most of the pros I know do it - you can have it spliced (graphics separated and turned into HTML) for next to nothing.
I am all for young entrepreneurs - I'm only 25 myself - but at 14 no one - especially a company - is going to take you very seriously. Not trying to be mean, that's just the truth. So your first work will need to be done through freelance sites, where you probably won't ever meet or even speak to clients on the phone.
There is actually a lot of business you can get that you will never have to interact f2f with, which is good in your situation. I have a client who we've done both a standard website and a large development project for, and I've literally never even spoken to him on the phone. All email. He's not the only one. So that is one way you can overcome the age factor.
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Google isn't as dumb as you think.