hey, i had undertaken a workshop years ago on animation. I can help you out with few basic.. but before that are you sure you can make any desired shape from LED? Thats the only pre-requirement.
If you do.. the process will be something like this:
1) Decide on some script?
2) How long is the running time? say 10 sec
3) Number of frames (images) needed= minimum 15 each second. (The more Frame per sec ie. fps the better us the video. IMO with LED you may require a min of 20 )
4) Draw a rough sketch frame by frame what you want to do.
5) capture the first set of image (say 20), edit them , run them in any video maker, review it and if ok go ahead with rest.
Please do prompt for any other help, it's an interesting project.