This is an example of what you can do in Magix Music Maker 14, if you know what you need for your machinima's soundtrack, somone with this program can help. (this file uses a tiny fraction of the sounds available for download, 4.03 Mb) 

You'll also need a good audio editing and recording program, this one is free:

Audacity 

I use it a lot and love it

Click here for a guide to Audacity

If you know where to find music or sound effects send the address here.

If you make music and would like to share it, send it and here.

If you use music found on this site mention the writer and title (if appicable) in your credits  

nathanwillsmusic.com: He is offering some of his music free if you mention him in your credits, I glanced at his site and couldn't find it but you can try.
 
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