Directory listing Website

I need a plugin or a script for my website Xnaj.com. (WORDPRESS) This is a theme i bought from [login to view URL] Theme name Vantage. First thing i need is :- I want Facebook/Google Login for the website. So Customers can Use their Facebook/Google accounts to List Their Businesses, Review On businesses. And give comments, please go read about vantage from appthemes about the script and theme. It includes payment system aswell, so you might have to work on that a little bit aswell. Second thing: On the search bar i need something like typeahead for both, Search And the Location So if the client types A it should show the related, and it will grab it from the database, a simple AJAX for Auto suggest. Third Thing i need when someone scroll down the search bar should stick on the top something like position: fixed on the top. And keep in mind all this code should be mobile responsive. And if you can suggest a little but design changes like a background for footer and some design changes that will be good. I want all Code Commented and Clean to read and Easy to implement, I will implement them my self. you will be given a test site to check it and make sure it works. I do not want New script or anything i want the same one modified. Thanks. Thanks.