Is there any templates like Etsy where people can sign up and sell things with a % going to the host?
Most I have found is something with crowd funding 
Search multivendor templates.
I have made several multi vendors sites. If you need a quote I can give you.
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I see one thats about it
How can I reach out to you?
For these types of functions, you need to buy a multivendor theme that are available at themeforest and codecayon. But you need to customize that to match your brand.