Creating your own eCommerce website has never been cheaper or easier!
1. Sign up for a free account at Weebly.
They have lots of tutorials and their site builder is really well done.
2. Study their tutorials as necessary & build your site.
4. Upgrade to a paid account that has the features you need.
Currently their starter account is $3.23/mo. when you pay for 24 months up front. I don't think you need the expensive business plan until your business starts doing a lot of volume. This would also be a good time to register your own domain name (about $10/yr.)