1. Start early.
If you have to give a speech, start preparing it sooner not later. The more time you have to prepare, more confident you'll be.
2. Research your audience.
Find out everything you can about WHO you will be speaking to.... What things do your audience members have in common? What are challenges they face? What is their education? The more answers you have to questions like these, more you can focus your talk to something that they'll want to hear.
3. Don't worry about being original.
If you speak passionately, from your heart, and believe what you say, it doesn't matter if you're first person or 15th to speak on your particular subject. The originality you provide is YOUR VOICE.
4. Keep it simple.
Smaller, shorter chunks of information are easier for audiences to absorb
5. Make them an offer...
Offer your audience a solution to a problem, a challenge to how they think or act, or an opportunity to learn something new. Create your speech around that offer ("Today I'm going to give you 3 tools to eliminate procrastination from your life forever...")