Presenting an informative speech is like walking a tight rope. Present too much information and your audience will overload. Presenting trivial or irrelevant material will soon bore the audience. So how can you do it?
Choose a topic or an approach to a topic that will interest as many of your audience as possible. That means that what interests you may not necessarily interest your audience. Know your audience!
One way to do it is to ensure your speech has structure. Break it down into digestible pieces and the audience will be happy to come for the ride.
Having found interesting material, aim to deliver it with an interesting voice and in an interesting manner.
A flat uninteresting voice will turn people off. Use a range of appropriate volume, pitch and pace. More on this is a later tip.