But the rough outline.
Helps if there is an agreed upon Vision -thats the place to start. This vision should align with a corporate vision if there is one. The Vision should be a short statement or paragraph which describes where you see the IT organization in 5 or 10 years in an ideal world - where do you want to be. This of course has to also aloign with the companies objectives and strategic goals.
Then I would put in an AS IS section, which is a state of the nation - where are you today. Following close is the SWOT analysis - what are the strengths, weaknesses, opportunities and threats facing the organization - the last two can be further divided into internal and external opportunities and threats.
I would then go into more detail as to the corporate objectives and goals - if you interview executives from outside of IT, this is where that analysis should go.
Then you can take those corporate goals/strategies and develop IT goals, objectives and strategies to meet them, and make the linkage back to the corporate ones.
You may want a section on the barriers and challenges to those goals (risks) and how you will meet them(risk mitigation).
I'd finish with a concrete action plan which lines up short, medium and long term objectives.
James