emacs questions

[James E. Bailey]

I'm wondering if anyone here uses emacs on macintosh and how they go  
about it. I have currently installed the default OSX cli emacs,  
version 22.11, Emacs.app (version 23.0.0) and Aquamacs Emacs.app  
(version 22.2.50.2) each gets some things well, and others not so well.
First, I have edited my aquamacs-mode-defaults.el and ~/.emacs so that  
they have lilypond-mode installed. And I've edited lilypond mode so  
that it correctly opens pdf and midi files. That's the best I've  
gotten so far.
With aquamacs, I can see the shortcuts to let me know that C-c C-l  
compiles, I have no idea where to find that information in the cli  
version or Emacs.app. Is there documentation somewhere on where I can  
those options in the other Emacs? Ideally, I'd like to be able to just  
use the command line version (since I'm coming from nano, and it could  
just be another screen in my screen session)
Aquamacs Emacs and the cli emacs can both compile lilypond files.
Emacs.app doesn't seem to load my $PATH correctly, because I get /bin/ 
bash: lilypond: command not found
All flavors can open the pdfs and midi files.
I haven't gotten around to trying to figure out folding yet.

Also, and this is probably just an emacs question, but, if there's an  
error in my file, and I use the compilation window to fix it, it's in  
a new temp file, and those changes are saved, but they aren't in my  
main file, and I haven't gotten far along enough in the tutorial to  
know how to make those changes show up in my main file, any quick  
place I can look for that, 'cause that's kinda annoying.

In short, I guess I'm just wondering where the lilypond emacs tutorial  
for someone who's new to emacs is. I'm totally new to this, I'm not  
really convinced it's better than nano, and I'm taking some time to  
try and get better with these things since it's summer break, so I  
thought I'd ask.