You might want to try WooCommerce (wordpress.org/plugins/woocommerce) which would give a lot of customization abilities in WordPress. WooCommerce is owned by Automattic, the makers of Wordpress. Or WP Shop (wpshop.io) could be a good option as well

I'd recommend Shopify, you can setup a store in literally minutes and it fairly easy to customize to get a simple store front live.

For simplicity/ease of implementation, consider Ecwid. It's specifically designed for this application.

WooCommerce and Shopify are solid, mainstream options that will give a wide range of customization options. Services like Wix and Squarespace also have ecommerce elements these days--I haven't used them myself, but I imagine less learning curve and less options/customization.
If you want to stick with the WordPress site you already have, then adding WooCommerce makes sense, or there are tons of other WP plugins that'll work as well. Lots of options available!

Depending who is hosting your account may be a resource as well. Mine is hosted on godaddy and I believe they can incorporate a retail function

+1 on Shopify - their backend for managing e-commerce is the best and as Casey said, you can have a site up in minutes. There are a ton of customization options and apps available for various plug ins as well.

Hey Will...I went through this myself over the last few years. I started on Shopify and migrated to WooCommerce at the end of 2019.

You really can't go wrong with either, but if you already have a WordPress site, I'd go with Woo.

I literally had a WordPress site, wanted to add a shop, so used Shopify. This was around[redacted]For two years I had this Frankenstein setup where I was managing two platforms, neither of which did exactly what I wanted. Really dumb waste of time by me. I switched over to Woo and it's been so much better and more seamless both for me and for our customers having everything together in one place that I can customize to my needs.

Both are great, though. I'd say Shopify is quickest to set up and most user friendly. But, last I used it, Shopify had it's own special coding language. I spent a bunch of time trying to figure out how to manipulate their special code myself to customize it. That said, you can hire people for Shopify.

Woo is MUCH more customizable, not only if you know what you're doing, but also for plugins and custom extensions. They have a ton of free and annual fee options that make coding so much quicker and easier AND customizable to your needs.

I've been off Shopify a few years now, but that's my experience. Both great platforms, but I loved the customizability of Woo and that it more seamlessly integrates with my broader site, which is also more customizable. Shopify is excellent if you're brand new, haven't built anything yet, and prefer an out of the box solution.

Hope that helps!

I have an ecommerce subscription company and I use Shopify. Later, I added a Wordpress site for our blog because Shopify's blogging software is not very good. However, Shopify's ecommerce solution more than makes up for it.

I'd recommend taking a look at Gumroad too https://gumroad.com/

I use Wordpress but would add a +1 for Shopify. If you're intent to stay on WP, use WooCommerce and add Square/Stripe to accept payments.