Need changes to open cart website

I need some changes to an existing website. i have an e-commerce website [login to view URL] which is in open cart and for selling books. I need following addition on my website. 1) this is not a marketplace website as a whole but for used books I want an option so that people can sell their used books to others. I want ppl to enter their books details and those books will be displayed under a menu 'used books' which is on my home page. every time a user uploads a product I want an email to be sent to the website owner (email address will be provided). If the user searching for old books(under used books menu) does not find its needed book, then he should get a message at the bottom 'Cannot find your book here? Let us arrange it for you. Click here to proceed. If the user clicks it a small form will come asking the user to enter book name, edition, author, ISBN. When user press submit, a message will be displayed (will be provided) and then email will be generated as Old book request. If the user searching for old books(under used books menu) does not find its needed book, then he should get a message at the bottom 'Cannot find your book here? Let us arrange it for you. Click here to proceed. If the user clicks it a small form will come asking the user to enter book name, edition, author, ISBN. When user press submit, a message will be displayed ( will be told message text) and email will be sent to website owner (me). 2) I want a QnA forum type thing on website where ppl can communicate and asks questions to each other. Please do not send long intros. I will be interested to talk to those who are serious and propose a solution. looking forward to talk to smart ppl. my Skype id is "[login to view URL]" - Thanks