Google - what do ineed to make a medical library?

Well, that is a huge undertaking, as there are many different branches of medicine. And who is your target audience? Medical students? Regular people just looking up information? Or a reference for health care professionals? There's basic anatomy, pharmacy, study of disease, criteria for diagnosis and treatment, the list goes on and on. I think Merck Manual has a lot of information in it. But you would have to get permission from them, and other books like it in order to display their information. I don't think the publishers of those books are going to want their information displayed for free by you, when they make their profit through paying customers. Perhaps you can pay experts to contribute and build information on your website, so you do not have to 'borrow' from somebody else's book. Better check out your experts credentials thoroughly, and display all of your contributors on the website. Good luck.