Hey Sam,
Congrats for putting up your website! Trying different things out with wix to get a grips of what you'd like your website to look like is definitely a viable exercise. Keep in mind though, that websites are a work in progress, meaning as you change, the layout and info you put out changes.
This being said, let's get to the "business" side of things:
Hosting can be a pain. I suggest you have a look at Shopify as they take care of this part. You can go with a default (free) theme for a start and upgrade along the way. Default themes aren't exactly speed bunnies ...
Integrating payment providers, bookkeeping and other necessary plugins. Unless you want to fumble around with coding etc, have a look at Shopify. They are not the answer to all there is eComm wise but they do a tremendous job. The no 1 ecomm wizz guy works with Shopify; his name is Ezra Firestone. He even teaches Amazon how to tweak and optimize its shops. That says smth.
Legal. Make sure you have your TC, PP in place. There are templates you can use too.
Furthermore, you can test Shopify for a couple of weeks for free and see if you want to roll with it. I've been in the ecomm biz for over a decade and happy to help you navigate it.
Most importantly, be aligned with your message. That of course you do my friend.
RE: Looking for feedback on the website through which my family will gift frequency devices to the world