I can't say I have ever encountered a "SM Guide" - however I have encountered "Stage Management Information Packets" - and am wondering if that is the sort of thing you are talking about.
As you are an education-venue, chances are, you will have fixed venues, so make sure you cover all the venue stuff - who to contact, how to book rooms after hours, what is and isn't allowed in what areas, issolation of smoke alarms (proceedure to do it OR who to talk to to get it done) etc.
I would probably preface with some information on the theatres, any famous people who have mounted a show there, or been trained by your school, etc.
Another section would be on prompt books - ie what NEEDS to be in the prompt copy handed in at the end of the show (rehearsal reports, absence reports, signin sheets, performance reports, incident reports, complaints against cast, disciplinary information, what ever).
Since it is an educational venue, you may not need to do medical forms, I don't know, but info on that should be included, as well as information about disposal of sensitive information (ie these forms) - I know that some places require sensitive information be destroyed by a contracted company, or incinerated.
Then there are the policy docs, position description, details about copyright pertaining to shows, and information about obtaining the rights for preshow music etc.
I think it would fall into three main sections - about us, what you need to do and "Legal mumbo jumbo"