Edit it and cut out the crap. Watch part 2 of my tutorials below:
The following videos were made for people interested in posting videos on YouTube, but the information can answer general questions about using Movie Maker as well.
I've made these YouTube videos to answer questions just like yours.
Please check them out:
1 - How to YouTube - Part 1
http://www.youtube.com/watch?v=4lrGpwaz_-k
2 - How to YouTube (Movie Maker) - Part 2
http://www.youtube.com/watch?v=NmLWlpCcT8M
3 - Movie Maker Tips:
http://www.youtube.com/watch?v=FXA9nSQVQwA
4 - Movie Maker Titles & Credits:
http://www.youtube.com/watch?v=aEHPIOMU4RU
5 - How to Make a Video with a Cell Phone
http://www.youtube.com/watch?v=FGzxPIBJiJU
6 - Stuff made entirely with Movie Maker
http://www.youtube.com/watch?v=dkn-yfCQHy8
7 - Making a Split Screen Video with WMM
http://www.youtube.com/watch?v=Monk3aOeDrM&feature=channel_page