Before you even give a presentation, there are a few things
you have to do:
Contrary to poular belief, each of these may be as hard as all the
others. Choosing a topic for some may be easy, based on their
expertise, whereas a Linux jack-of-all-trades may be stuck choosing
a topic. Those comfortable with public speaking may have trouble
designing the slides, and so on.
So let's jump right in and hit all the topics and get you started!