Playing with noise

I've been recording a lot of Foley sound for my animatic. Fore fire I rustled a lot of wrappers and paper, I also followed Ali around with the Zoom because she had a cough. It was nasty for her but it would gold dust for my piece.
After talking to Chris Mann, he suggested that I should look into apple-loops for some music, percussion especially. He also said I should source a scream online so that it is much more impactful.
I also realised that my piece is very weak in the mid-range section, it lacks the rumble which you would normally get with fire and with folks running around gettin' squished by trees.