By this point have probably chosen a video editing program to work with. But if you haven't, you can find some free video editing software suggestions from the About.com Guide to Desktop Video, Gretchen Siegchrist. There's also a simple and free program called JPGVideo that does just what you need it to do for this project, but won't have any of the bells and whistles of bigger editing programs.
Ok, regardless of what program you're doing, you'll need to import the pictures into the software. You may need to do this more than once if your digital camera runs out of memory while filming. Just try not to move your camera and/or tripod!
When bringing photos into the video editing program, make sure that they're in the order in which you shot them. If not, take a moment to rearrange them.
Each editing program is different, so use the manual or help function to add the photos to the video timeline. Each photo will act as a "frame" of the movie. Make sure there are no transition effects playing in between frames (except between scenes!), as that will disrupt the animation.

