That is a very large project, especially for a newcomer to web design, and there are a lot of considerations to take into account.
Will the site and its contents mainly be available internally over a networked intranet or will it serve for internal and external access.
You will need user registration or some system of registering existing students for access to the site, or will all information be freely available to absolutely anyone who visits ?
I’d imagine that you will need access rights restricted to at least some sections for a number of possible reasons.
Most of the systems I know of along these lines provide links to download documents, research articles, case studies and their findings and all kinds of other things (my wife is in psychiatry and I lecture part-time at a local college).
Although much of this can be outsourced to some of the large medical journal sites, you will still no doubt have a substantial amount of information you will want to make available that cannot be outsourced or linked to, and so you enter into some serious issues.
Download document type obviously should be PDF for security purposes (among other things) which entails investing in PDF creating software. This varies in features and cost, but Adobe Acrobat is the standard and for good reason.
Bandwidth - you will ned a lot of it, especially for delivery of video clips and audio (if you want to use it).
You will probably need some sort of cataloguing system to keep track of what you are offering and any revisions or updates and so on.
This may be reflected in the site itself, which should be fully searchable, and this is where it can start to get very complex to those not familiar with dynamic site content.
It would simplify things if your catalogue database could be queried online by students and items selected from it; a branch of the same system could be used to deliver teaching modules and training material.
I’m just bouncing some of the concepts around that I think you will probably require (there are many more) and without going off on one, for any reasonable information delivery/access system to work properly you are really talking about the kind of thing that you call in a designer to do for you.
Newsfeeds, bulletin boards (and the user registration involved), all of that form processing and so on will require a great deal of dynamic ASP or PHP (Perl/CGI could do some of it) and the appropriate databases to work as nature intended. Some of your criteria can be met by using third party solutions under license, but nothing will meet anywhere near all of your requirements as an off the peg solution.
If you would like me to suggest some of the products that you could implement I will, but no matter how eager you are to learn, dynamic sites is one area that brings most people to a very abrupt halt.
Post with more information if you can and one of us will try and point you in the right direction.
Doesn't your IT department have someone who can at least get the ball rolling for you or begin an evaluation/case study based on your requirements ?
Something of this size will need to meet the requirements of any and every department at the hospital for iformation delivery and will need to be very carefully planned to be properly implemented.
Sorry if I'm raining on your parade but, as I said at the beginning, it's a very large project and with all the software under the sun (and the knowledge of how to use it) I'd also suggest that it might not be a one person project.