Use this short tutorial (PDF) to make your slide show advance automatically. This is used for creating music videos or other slide shows that run unattended.
When you are finished creating your slide show and ready to turn it in to your instructor, you may want to save the file as a PowerPoint Show (.pps extension). Then, when your instructor opens the file, it will open directly to slide show view.
With your finished presentation open, go to File > Save As.