Already built a ecommerce site with WordPress 3.8

Already built a ecommerce site with WordPress 3.8 and WooCommerce and it appears it might not suit my needs so I am looking to create a new ecommerce web site with WordPress and MarketPress?. With this site I will want to be able to host other sellers and their products (which I guess is called a marketplace?). With this I have 3 questions:

1.) Is this a product that a beginner could use and get a site up and running in a couple of weeks?

2.) Will I be able to allow access, add only, to site for these sellers to add their own products?

3.) Is there a payment system that will allow a percentage of the sale to go to both the seller and to me as the owner of the site?

Thank you.