This is going to be a quick guide to installing, customizing and upgrading Express theme to Shopify Online Store 2.0 theme.
Install Express Theme
If you want to install one product Shopify Theme, Express theme could be the one you want. This video shows how to install Free Express Theme on Shopify store.
Customize Express Theme
If you have already installed Express theme on your Shopify store and would like to customize the default options available with Express theme, this video might help you.