PPC Campaigns

You can start PPC (Paid Per Click) campaigns with Google and MSN.
Lately Yahoo seems not to be a very good option from a paid per click svieuwpoint. This  should not be your first choice for web promotion because the options mentioned earlier on  give you some time to test the effectiveness of your websites sales page (The conversion stats on your website)
Because you are going to directly pay for your traffic on a paid per click basis you should be  pressty sure you are earning on the click. Your sales process should be pretty good before starting a PPC campaign.
Two of the most popular methods of getting traffic from search engines include PPC - Pay Per Click - and SEO -  Search Engine Optimization.

PPC:
Pay Per Click is advertising provided by the search engine providers (Google, Yahoo! and  others) where you PAY for top placement. Their strategies for placement differ slightly. Some search engines will give you higher placement if your ad has a higher click-through rate (meaning more people click on your ad in ratio to the amount of times your ad was shown), others give top positions to the highest bidder.

In either case, you PAY. It is a quick way to get listed in the search engines and a smart way to get your traffic flowing but it is not the cheapest AND you could spend far more than is profitable for your business if you don't know what you're doing.
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