I need help creating a sequence diagram for Fine. And a sequence diagram for catalog

Our public library in Smallsville is in need of a computer system to help keep track of who checks books in and out, as well as to keep track of fines and print reports for us. We have been making out fine for years recording the information by hand, but Sally and Mary just dont have the handwriting they used to, especially at 72 and 81, respectively. Our new librarian, Marcus, is young and energetic, and just doesnt have the patience to keep handwritten records. As head librarian I want to be able to do more for our community than just keep track of books, so I want to be able to mail out notices of special events and the like.

Therefore, I have made note of the items I think need to be included in this system. Keep in mind that I know very little about computers, so I have probably left something out. Please feel free to make any additions or corrections that you feel are absolutely necessary. Also bear in mind that we are a small town, and do not have an unlimited budget for such a system or the training required to use it. A single PC should suffice for our needs right now, but we might want to grow to two or three, connected together, in a couple of years.