Here is a set of training videos designed for pastors wanting to use PowerPoint in their sermons or lessons. If you want to use PowerPoint quickly and effectively these videos should give you some great ideas. The goal is to be able to turn a sermon outline into a presentation in about 15 minuets.
These videos have been prepared to be short so they can be referenced easily. This method is not comprehensive, but they should give you an excellent platform to build on as you use PowerPoint with your own presentation style.