Though I really hate stick men, I'll try to help you out...
There's a variety of ways that you can make stick men move\:
1. Frame by frame - Drawing picture after picture in frame after frame to give the apperance of movement
OR
2. Motion Tweening - Letting flash put in all of the frames at a specific frame rate between one position of the stick man and another. You can learn about this in almost any basic flash tutorial on Newgrounds, or I think that even flash offers a basic tutorial under help in the program.
(Sorry it this wasn't any help)
Anyway, I think that expirementing with stick men is a good idea, but PLEASE do not submit a shitty flash movie to Newgrounds if it's just going to get blammed. You should work on your skills a little and submit something atleast almost worth watching.
Have fun!