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Struggling to create a ecommerce site for client

I’ve never done a commerce site before and I’m struggling to create a site for a client’s fast food outlet.
The most basic thing I’m confused by after following the eCommerce tutorial is how does the eCommerce template transfer to the main site pages?
The other things are more complex.
The client just wants customers to be able to choose items and send an order through to the outlet, no payment options are to be included or shipping methods. If the order requires delivery this is only available within a certain radius and payment is either at the outlet or on delivery.

Any help would be gratefully appreciated

Here is my site Read-Only: LINK
(how to share your site Read-Only link)