[MarketPress eCommerce] Some Questions

Hi, I have some questions about the Marketpress plugin.
I want to build a site like Etsy with it. Which possibilities of the fee calculation for the members I have. Unfortunately I didn't find anything useful in the plugin configuration.

My wish would be a fee for the posting of the articles.
A sales fee as a fixed amount (minimum amount) and a percentage of the sales price. Which ways do I have for it?

Thank you very much for your help.
Greetings Matthias