One more suggestion. Hope it doesn't come too late. If you're loading them up yourself you don't have the option of putting them into categories so don't put too many files on any one card. It would be great to have a bunch of cards with no more than 50 files on each. That will be about 5 pages of files on each card. It gets a little frustrating to wade through twenty pages of filenames to find the one you want to read.
Don't forget about all the great books available here.
Have a blast,