You can sell on Alibaba by following steps:

a. Search and browse buyers in whom you are interested, and send quotations to them by clicking on “Contact Now”;.

b. Let buyers find you by posting your own Selling Leads and products as well as your Company Profile.

Learn more about how to contact buyers on Alibaba by going to:
http://www.alibaba.com/trade/servlet/page/help/selling/contacting_buyers.