What we're really hoping is that you've already gone through Carol Kaehler's great help stack (the one you got with HyperCard) and read a little in the HyperCard user's manual. Of course, if you just want a library system and would rather not get into HyperCard, that's fine. You might think about finding someone who IS a stacker, though, and asking them to take a look at OPEN STACK -- just in case you have some special little thing you would like to see OPEN STACK do.
Once your version of OPEN STACK is final, your staff need know nothing about HyperCard at all to enter data easily and comfortably. If any of them show a predilection for experimentation, though, ENCOURAGE THEM!