Message

Hello i'm new at Koha and if anyone could help me i appreciate. I've installed Koha 2.2 and one of the features that i am most interested is the possibility to function as a document manager or digital library. I just don't see how can i do that. I still didn't figure how can i insert for instance a "pdf" document into the database. Can anyone give a clue for i can start studying this feature because i'm a little "lost" at this moment. Thank you very much.