Car sell Website

Hello, Happy new year! I will like help and ideas how to implement a world wide website about cars, with 3 membership plans.... see attach picture of home page (design is not finish...maybe I will change it completely...but ... I'm interested on the membership plan (paypal preferred) and the admin for sellers and dealers I will like ideas and a estimate cost for it... right now I'm very low on budget (holidays) If some of U like we can become partners, I will like to start this project on March 1, and I want to be able to edit the pages (so a CMS will help