I have recently taken it upon myself to coach and help prepare editors on how to become better administrators. To do so, I have developed a four phase system (described in the introduction section) that helps to cover all the aspects needed and to discover strengths and weaknesses more effectively.
I will use this page as a glossary of questions and to update/keep track of new methods. Feel free to make comments on the talk page about this, and to suggest changes and additions.
Generally, the phases should be given in chronological order. Questions in Phases 1 and 2 should be given three at a time, while questions in Phase 3 should be given one at a time. After coaching several users, I have determined that it is best to limit the number of questions a user can respond to in one day. This allows the coachee to develop over time. I suggest a maximum of five questions a day in phases one and two, one section a day (including followup questions) for phase three, and at least a month for phase four (about 58 days if done fully). Of course coaching can be done slower than this and is more beneficial if conducted at one's own pace.
I will be implementing Balloonman's footprints strategy as well. This will come in phases one and four.