Wordpress Expert Needed - Modifications To Wordpress Based Site

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The site has been built using the Voice Wordpress theme with some modifications. The following capabilities are needed:
1. discussion capability - posting of questions, order of discussions, display of comments, and sizing/placement of text to be adjusted; add ability to view previous comments to older discussions
2. books - update descriptive text and load books to be sold; ensure that payment and email delivery of book functionality is operational (already implemented, just need verification)
3. conference - display conference information (agenda, speakers, logistics, etc.); registration and payment functionality (will provide the design for the page)
4. login/registration - modify login capability; update aethetics of login form (design and sizing/placement of text); ensure that registration verification emails contain the needed content and formatted
5. overall aesthetics of site - adjust sizing of text, maximizing use of page real estate
6. posts - when click on a post, instead of displaying on a new page, would like to display in a pop-up
7. ensure the site remains responsive

Would like to hire someone who can start right away and dedicate time to getting this done immediately.