Unfortunately instruction manuals on this issue written in the past are presently not available to me, but they surely contained a lot of good advice regarding the daily realities a devotee who accepts managerial responsibility has to face.
Sometimes devotees tend to reach out into the material world for help on how to successfully manage large groups of people. Such books are of little use for a manager in Krsna consciousness as Srila Prabhupada’s movement is conducted under very different conditions compared to movements in the “ordinary” karmi world.
Srila Prabhupada would warn his disciples in managerial positions in letters to them that his movement is a movement based on preaching and on VOLUNTARY contribution of those who responded to the call of the sastras and surrendered their lives to the Supreme Lord. No karmi has to face such a responsibility as in the material world a material reward for ones contributions is always expected, either in form of money or in form of name fame and glory.