Here Kent university talks about giving a presentation. I like the bit about the structure of presentation. I am currently using Prezi make a presentation and this will help me structure it.
One of the tips suggestes to add video and photos to improve the presentation. In our situation we can use photos so we have something to talk about.
One of the point mentioned is to rehearse the presentation. Rehearsing is the best thing to do so the group knows who is going to talk at what point.