E-commerce site

Hello, you need to create an intermediary site in the field of e-commerce - an intermediary for buying and selling on Ibei, helping people sell their goods at various auctions. Specifically, accepting payments from buyers from any country in the world through a paipal and moni booker and withdrawal of funds. Convenient navigation and calculations panel in the personal account and a convenient and functional administrative page.
Thank you, I'd be glad to hear suggestions.