Hi there,
The WordPress theme I’m using is Flatsome. Is what you’re suggesting above something that replaces Flatsome?
That is correct, the Storefront theme will replace your currently active theme.
Or are the themes you’re suggesting above only for the WooCommerce aspects of the site I’m building?
When a theme is activated it will run on the whole site, so even if you have a WooCommerce shop and decide to add a blog page to your site, the template of the blog will be from Storefront. ??
Hope this helps!