I have owned a small used bookshop for 18 years and have tried out os-commerce, zencart, opencart and not happy with the bloated software not designed for my needs.

Re-invent the wheel? Perhaps

My needs: catalog books, comics, zines, records, cds and odd collectibles like old car license plates...
I need English and Japanese (to start)
DATABASE: 1st step is to build the database with an easy & quick entry process for me to add new items and edit. Needs to work smoothly on mobile phone. Plan is to streamline and automate as much as possible so I can quickly enter books.
ONLINE CATALOG BROWSING: Easy experience for the customer. Bootstrap for the css/graphics as its uniform, modern, easy and looks good on mobile phone or desktop.
PAYMENT:
SHIPPING:
NEWSLETTER: allow visitor to sign up for newsletter to receive updates.