Whether you pursue an Honours thesis, Master’s, or PhD, you will definitely need to make an oral presentation to your group, or a broader audience, at some point.
When you become aware of this, the first thing you need to determine is the time allotment you’ll have, including questions. Make sure you are clear on that: is it 15 minutes total or 15 minutes plus 5 minutes for questions?
There are a number of good tips in this document: Stuart Prescott’s Presentation guidelines
To best use these tips, make sure to get some practice before the main event!