jigneshgohel - 10:33 am on May 27, 2013 (gmt 0)
Most of the people have provided detailed information on promotion.
I just want to add one very important point specifically for eCommerce vendor like you.
Start selling your products through shopping comparison engines in which Google merchant center is the best i have ever seen.
CPC is low as compare to Google search network and you will really get bunch of most relevant traffic that can be converted.