Is it a local store or an online store? Anyway, if you don't sell online, you need to start so get yourself a website. You can use https://en.archivarix.com/
website ripper to get a copy of an already existing website and use it, that would be the easiest way. If you already have a website, it's a great idea to add some features and you can do it the same way, just get a copy of a website with features you like and look how those are made.