Add a wordpress multivendor plugin to a site thats already live.

I am wanting to add a multi vendor plugin to my website so i can get other manufacturers to sell on my current website without me having to deal directly with the final consumer.
I will want the plugin so i take a commission from each sale and eventually have it so i can also take a monthly fee for them to be on the website. I will also want it so the payments are delayed for a few weeks to cover when delivery is made and doing refunds im not left out of pocket waiting for funds to become re available. There will also need to be a way i can see all the emails as to make sure people arnt directing customers away from the website and making sales without paying the commission.

As said previously i already have a website shedstolast.co.uk and this is what i would like to convert to the multi vendor. I sell my own products i make and also from other manufactures but i would like the other manufactures to just sell there and me take a commission.

will want payments made though stripe.

will need work to be carried out asap