Marketplace Development

Hi, I need to add the following functions to our site:

1. Ability for customers to add their (boat) listings to this marketplace.
2. Take payment for adding listings. (open to suggestions)
3. Create user accounts for clients.
4. Management page to manage multiple listings under their account.

Here is the site:
https://www.boatdeal.com.au/

Please provide a quote and approx timeline.
Many thanks.