Not bad
There's room for improvement, but I can tell that you spent time on it. As far as a replay button goes, right click on the button that you made and bring up the action menu. Double click the "goto" command to add it to the list. The actionscript window should read:
on (release) {
gotoAndPlay(1);
}
When the user clicks and releases the button, the movie will goto frame 1 and will play the movie. You'll have to tweak it if you use multiple scenes, but that's about all there is too it. Oh, for the hit area frame of the button, make sure that it's the full oval and not just the text. It gets annoying when you have to click on the words. Good luck on your future projects.