First: If you don’t have it already, get the beginner’s guide: First time at a Sacred Harp singing?
Second: You can buy your own copy of The Sacred Harp here. There will also be a limited number of copies to purchase at the singing school.
Third: Here are handouts from the first session of the Singing School (September 11, 1001):
Fa Sol La scale, major and minor.
100th Psalm tune (Old Hundred), in 4-shape notes. Words for this tune may be found here.
New Britain, or Amazing Grace, in 4-shape notes.
Wayfaring Stranger, in 4-shape notes.