An internet site can bring increased sales and visibility to your company, or it can be a sinkhole that drains cash and and resources from more important activities.
1) Publicize your books and send orders to Amazon, thus saving you the headache of fulfillment or
2) Publicize your books and refer customers to retail stores that stock your titles or
3) Sell directly to buyers for the higher profit margins on direct sales, sales to foreign customers, and to build a customer list.