This book is basically a WFM textbook and covers the major principles:
https://www.amazon.com/gp/product/1932558063/ref=ppx_od_dt_b_asin_title_s01?ie=UTF8&psc=1`
This one focuses more on the core staffing principles specifically (and easier to digest):
https://www.amazon.com/gp/product/0974417904/ref=ppx_od_dt_b_asin_title_s00?ie=UTF8&psc=1
/u/Pseudocrat gave good info/suggestions on Excel