Dokan customization

Hi there, I'm a junior developer who is making one of his first webpages to a client. It's a marketplace where people who what to sell hq wallpapers enter, create their account, and put the downloads there. entering the marketplace will show many vendor's products all mixed. I'm using Woocommerce and Dokan. I'm finding 3 problems I'd like to get help with: 1.- So my client wants that, everytime a customer buys something to a vendor, the money will go to a vendor's wallet or balance (even if the admin's stripe will hold all the money together) so that vendor could buy directly from another vendor, without making a new account or going though the payment processor again. Like an internal wallet attached to each vendor so they can spend their earnt money without. I going crazy looking for plugins that make this, but they only seem to generate a way of prepurchasing some credit, to then be capable of spending it. I want that the vendor balance gets filled each time he sells something. This is my main concern. 2.- I would like to introduce another description fields in the dokan's new product page. I'm capable of creating them, but I can't get them to save and print in the saved product. I have even the solution to this, but I don't know where to put the code. In the image example I have changed the default field to sobre el transporte, and created two more, one called sobre la comida. But when something is written in the second and third field, nothing shows in the product. 3.- The last issue I have is creating an additional menu item in the dokan dashboard. I have the solution too, but it doesn't work properly. In the example image, I have entered the Help menu, but when pressed it doesn''t show anything in the right panel.