1. Create a search marketing budget.
How much will you need to spend to get a sale?
How much profit do you make per sale?
How will you track and improve your ads?
2. Advertise through Google Adwords.
Largest market, most searches
May need to focus on a smaller niche to be profitable
3. Advertise through Yahoo Search Marketing
Moderate search volume and competition
4. Advertise through Microsoft adCenter
Moderate search volume
5. Advertise through Ask.com
Low search volume