Hi Darren,
My personal opinion,
I find Shopify to be very heavy on the fee side of things. Editing/SEO is quite limiting and hard if you were to manage it yourself.
In terms of Woocommerce, yes there are fees involved on an annual basis. It may take a while to set up, but it will be worth it in the end. My suggestion would be to use Woocommerce.
Wix is also great but limiting for customization – SEO can be hard to sort.
You can learn more about set up for online shopping etc on digitalboost.co.nz
Make sure you have a merchant bank account if you plan on selling lots!
All the best with whatever you decide to use.