Objectives
The first questions you should be asking yourself before you get up there are: What is my goal here? What is my message? All tantamount to objective of course. This is the macro view of the presentation now and the details will come later (unless your analysis of the objective happens to take place 10 minutes beforehand like my former colleague's. For your sake, I hope not).
Who's around you?
Who are they? How do you have to deliver your presentation, as a result? Your style will naturally differ if the big boss from the head office is in the house, or if the audience consists solely of people from your project team.
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