Where to Start
The best place to start is to decide on a topic of discussion, having a solid starting point is step one to success!
Getting Prepared
The second step is to prepare your presentation. Being prepared not only helps your presentation be better, but also helps your confidence levels when presenting.
Confidence is Everything
Having confidence while presenting is arguably the most important aspect of public speaking. Speaking with confidence makes it seem like you know what you're talking about, and gives your presentation a professional feel!
Improving
One of the most important things for improving any skill, is learning how to improve. Try to learn from your mistakes by recording yourself, and finding what to improve on.