Build me a website

Hello sellers! I am looking for a website that is inclusive of all the latest functionality for a design agency. The purpose is to display and sell projects/products, which has a separate workspace to collaborate with my associates like, setting up the tasks/targets, assigning projects, payments, and more. I am open to suggestions and will be happy to discuss the project with the right person. Thank you.
PS: There is no time constrain, and I would like to get a reasonable quote.