Tell how you did it. Suggest other applications. Summarize what it all means. Tell your story in a straight line. Make one point lead to the next.
Understanding is better when the subject is simply organized.
Since good technical talks are an effective mix of verbal and visual elements, spend about as much time on your slides as you did on your paper. Plan a series of slides that progressively discloses your subject, building from cause to effect, simple to more complex, questions to answers. Don't bury your points in too much detail. Use your slides to assist your words and keep you on track. The text of your slides should be concise.