Document Database

I am trying to include a document database in my wordpress site. Each document will be added as a post, the post being a summary of the document and there will be a link to view the actual document in .pdf format. I would like each document post to have some custom fields such as

Title:
Author:
Document Date:
Another Field:
…and so on.

I figure I will create categories for the types of document and use tags for the subject matter.

Can anyone help with this? Any idea’s or suggestions would be appreciated. Thanks