Its really easy, I post videos on youtube which ask you to visit the site for the second part, you then build the rest of the model while adverts are shown to you. They provide me with money because lots of people are viewing them. That is the reason I have to have the adverts. Im only 13 and I make about £10 ($20) per week for very little effort put in. If you want to make your own website and make easy money just like me then use the links below.
Click here for Blogspot
Sign up for a free account here and create your blog, only takes about 2 minutes to create your website.
Click here for Adbrite
Get an account with adbrite which pays you alot more than any other site does. Then all you have to do is create your content( in my case knex instructions), add a couple of adverts using adbrites help guide and your away.
Good luck and feel free to e-mail me any knex related websites you create and I will give you guidance.