Start Affiliate Marketing!
Affiliate marketing is one of the simplest, and therefore most common, ways to make money online. Tens, possibly hundreds of thousands of people world-wide have started an affiliate marketing home business online, either to supplement their income with a few extra dollars each month or with the intention to create a full work-at-home business opportunity for themselves.
What is it about affiliate marketing that leads so many to start affiliate marketing? For most, it's the ease and low upfront investment needed to start their own online business. Since you're promoting other people's products as an affiliate, there's no need to delve into product creation, build salespages, create the graphics, etc. That's already been done by the merchant, leaving it to you simply to drive targeted prospects to the salespage. For each of those prospects that purchases the product you, as the referring affiliate, make a commission that's usually in the form of a fixed percentage of the selling price.
And since you're not creating the products nor the websites, you're also not limited to doing affiliate promotions for one product, one merchant or even one niche - you can promote any products or services that have an affiliate program - and there are tens of thousands of affiliate programs to choose from these days. Naturally, like starting a business in any field, there is the potential to make nothing or even lose any time and money you invest when you start affiliate marketing, but being prudent in researching the industry before starting and doing your full due diligence as to the benefits and pitfalls of the business will go a long way towards helping you make informed decisions.
For a more detailed description of what affiliate marketing is, read the Google knol on Affiliate Marketing
As to driving traffic as your main affiliate marketing activity, this video shows just one of the many ways to drive targeted traffic to your sites, blogs, squeeze pages and affiliate links: