Advice other than "Get your nob out"? There's a couple of things I use / would advise.
1) Don't be afraid of silence. Don't rush to fill every gap. You wouldn't want to listen to a solid block of speech with no breaks and that's not how people speak in normal day to day conversation. If you feel you're rushing and are looking to pause I find taking a nice even breath and exhaling gives a few seconds break of a natural sounding and feeling pause. That moment of dead air can feel like an eternity but it really isn't that long.
2) I would never use a microphone. Project your voice. This is different from shouting. Be clear, calm and deliberate with your language and "aim" your voice to the back of the room and launch it from your stomach. If you are going to use a mic then be very careful not to talk to it and remember you're addressing an audience. Same advice if you're referring to notes - stop to look at them (a pause to look at your notes will feel like an eternity of silence but, as I said above, it'll feel like just a short pause for the audience) but never ever talk directly into them. Also, don't just stand there and read straight from the page. I find a set of important bullet points and key phrases are better than a word for word transcript of what you want to say as it removes that issue.
3) Enjoy yourself and let your passion shine through. If you sound bored as shit giving the talk then you're going to find it hard to inspire and interest your audience (this is a common thing issue I flag up with new / trainee teachers). Alter your voice as you are talking - a contrast of loud and soft (which is tricky to do while projecting) - keeps your audience on their toes and is more interesting to listen to. I think my voice is one of my key strengths in my teaching. I don't shout and scream at the kids when I'm trying to get their attention - I use more of a "whip crack" effect. A short, sharp word like "RIGHT!" followed by a drop in volume in volume and a hushed tone is much more effective than constant bawling. Gesticulate a bit too but not too much as it can be distracting.
4) All else fails? Get your nob out.