Marina berth Exchange

I have an idea to a marina berthing site to show marina berths for sale, to rent and to Swop, also show a database of all marinas across the world and add reviews, also to add anchorages of places stopped and add the reviews that will cover the world for berthing your boat, All the contact information will be blank until logged in to the site (set free period then subscription per year) Live entry of your advert updated to the database and viewed direct online, this will add a icon on the map and also created a list view this will be for Swop,sale,rent,[login to view URL] for sale only, if the member clicks on Add new marina or Anchorage this will be stored in the data base and show on the map and reviews and photos can be added and the information can be updated by all I have taken the map and review idea from [login to view URL] I have contacted the owner but he has no time to do this for me I have stared a Wix site: [login to view URL] The data base is not what I was looing for and I had to sync each time to make live (Boats for sale) so have decided web design is not for me and need your help, I have added an attached file that I hope will give you a basic idea