[Trombone-l] Home recording setup

[Nick Mahon]

I'm trying to get a decent setup to record my practicing.  Based on  
research and recommendations, I've bought a Shure SM57 mic and an M- 
Audio Audio Buddy preamp.  I want to hook this setup up to my iMac  
(which does have one of those mini PC microphone inputs).

So in summary:
Shure EM57 ---- XLR Cord ----> M-Audio Audio Buddy ----- TRS Output  
-----> ???? ------> iMac

Do I need to buy a USB or Firewire interface to hook the preamp to my  
computer (if so, recommendations)?  Or can I use some sort of  
converter to convert the TRS cord to hook to my computer?  I'm not  
looking for amazing sound quality, just something better than my  
internal mic.

While I'm at it, anyone have a preferred mic stand?

Thanks for any help.
Nick Mahon