You have to have a topic for your speech.
- Pick a topic you know something about or want to know something about.
- Not a good idea to pick a topic you are not interested in - you will not do a very good job.
- Remember your audience - they have to listen to you! Andrew Dlugan in his Speech Preparation Series states "a successful speech is one where the audience receives the message."
Some great advice on picking a topic:
http://www.speech-topics-help.com/
http://sixminutes.dlugan.com/speech-preparation-2-select-topic-idea/
http://www.wikihow.com/Choose-a-Topic-for-an-Informative-Speech
Still not sure? Try this site for some suggestions: http://www.hawaii.edu/mauispeech/html/infotopichelp.html