You can't actually add any type of symbols to Windows Movie Maker. The only way you can have an arrow (or symbol) in a project is if it is imported 'ready-made' in jpeg or gif (animated) form.
You can only add you voice to a project if you have the narrate feature with your Windows Movie Maker. If you are using Windows Live Movie Maker, then the feature is NOT available. If you don't have...
Adding audio/music is easy in Windows Movie Maker. First, find the music that you want to add to your movie and import it into your project. Then, add the music to the Time-line on the Audio/Music...
I don't know what you mean by add people. Just take your imported media and drag it down into the time-line or storyboard. If you are asking how to add voice, you do that with the Narration feature...
Yes! I do this all the time. First, import the song that has the clip you want, then play through the song until you get to the start of the clip you want. Right then (this can get tricky) you push...