Deciding on your main idea
Once you come up with a lot of ideas by brainstorming, themes often start to become clear pretty quickly. Using Post-Its, software, or scissors and tape, you can move them around and group them in order to see what really stands out in order to find your objective. If you find that you have several big ideas, you’ll have to decide if you can discuss them all or if you’re going to need to edit them down in order to provide your audience with a focused talk. At this point you can start trying to solidify your objective. Try to come up with one sentence that describes what you want to accomplish with your presentation. If you can’t do that yet you may still need to work on defining your “big idea.”
Researching your material
Once you’ve targeted a main idea you can take a closer look to see if you have enough material to support it. Maybe all you need is data that you already have filed away somewhere, or maybe you need to go on the internet or –God forbid– to the library, in order to support your ideas. During the research stage you may find a lot of new raw material to throw in with what you generated during your brainstorming sessions and you’ll eventually have to figure out where it all fits, if it fits at all.
Hopefully you find evidence that support your ideas, but you might find yourself changing your mind about your original plan. There’s no shame in this– in fact it’s the sign of a really thoughtful presenter that they are flexible enough to change directions when necessary.