Cloud website/application for Dentists

I need to create a software which allows dentists, to see their patients' profile online. That is they can see the patients' notes, xrays, history ... . It will also allow the to see their daily appointments. It should be synchronizing with the secretory's pc all the time. It will let them to take care of financial issues (printing an invoice and keeping the financial matters in the cloud system). It also should help them register new patients. It should work offline and online It should be working on Mac and Pc (the mobile version can be limited) Upon dentists' desire the cloud website/program can be used for patients to book appointments. Can be finished by may 1st. Regards