match maker

I have a website with squarespace but they don't provide user login page views.

Requirements:
1- want to be able to register and provide an account login to my website as either a buyer or seller
2 - match buyer and seller based on zip code vicinity if possible (USA).
3 - provide register buyer, once logged in, a page view showing close match of 4 or 5 sellers that matches their requirements.
4 - requirements could be language, discount range offerred, years in experience, seller feedback rating.
5 - if you could provide UX design to upgrade my current squarespace site would be great or extend the theme to new page views better
6 - Please provide how long and when this can be accomplished and provide any sample work if you have them.
Last if this project is done, another will be given, as we have several listed.