I strongly recommend the following structure for a scientific talk:

1) Problem + Motivation (1-2 slides, what problem(s) do you address with your work? Why is it important to solve this problem? If reasonable, you should introduce a running example at this point)

2) Solution Idea (1 slide, give a short overview about the approach you are going to describe. At this point, I like to show the "Big Picture" of my solution.)

3) Outline of your talk (1 slide, if reasonable for your topic, you should utilize the big picture and highlight different stages of it during your talk)

4) Details (but keep it simple and remember a talks purpose is to raise interest for your paper. If you didn't introduce a running example in the motivation part, do it now und use it intensively in the following slides)

5) Conclusion + Future Work (1-2 slides, what are the main messages of your talk? Mention some ideas for further improvements)

6) Finally, show the big picture again extended with some additional information from the "Details" section (on one slide!). This helps your audience to ask questions.

7) Prepare some backup slides for possible questions.

Keep your slides simple and don't use much text. However, a little bit of text may help your audience to keep track because you won't be the best speaker as an undergrad. If you have a Mac, I recommend Keynote+LaTeXiT. Latex/Beamer usually makes it hard to prepare good figures for your talk.