YOU NEED TO INSTALL WOOCOMMERCE PLUGIN TO ENABLE SHOP FEATURE.

WOOCOMMERCE USAGE GUIDES AND PLUGIN ITSELF CAN BE FOUND HERE:

http://www.woothemes.com/woocommerce/

1. FOR CUSTOM SHOP LAYOUTS USE ESSENTIAL GRID.

2. YOU CAN CHOOSE SPECIAL PRE-MADE WOOCOMMERCE LAYOUTS IN ESSENTIAL GRID.