Google Adwords can be used to drive targeted traffic to a sales page. You simply make an ad in your adwords account then use your affiliate link in the target page URL of the ad. Obviously, you will have to continuously measure the conversions and see if the campaign cost is less than the campaign profit in order to keep the campaign running but I am sure you get the idea.
These aren’t the only ways teens can make money online. If you explore other options, proceed with caution. Read user reviews before signing up for any website to avoid getting caught up in scams. At best, those are a waste of time. At worst, they can cost you money and put you at risk for identity theft. If you aren’t sure a site is legitimate, stick to the basic rule of thumb: If it sounds too good to be true — like the employer that doesn’t ask to see a resume but offers to hire you on the spot — it probably is.