When I switched to Mac 2 years ago for all our businesses creative, I was coming from Adobe's world of Audition, or Syntrillium's Cool Edit Pro (originally before purchased from Adobe). I used it exclusively for audio editing for over 10 years. The ONLY reason I have Windows on a partition still is to use Audition.
However, since then, I have purchased Logic Pro and the Apogee Duet and Ensemble. Overwhelming to learn by looking, especially with my Aud/CE experience...Then I found Lynda.com I know it's been talked about, but what a gem on the net. Doesn't matter what software you want to learn....I have found that especially the FCP and Logic classes are compelling, quick, and easy to learn. $25 a month is a bargain...take as many courses as you want and learn to use Logic and Soundtrack Pro like a true Pro.
I still use Audition in some cases, but Logic is Incredible. No experience with ProTools, but I've heard great stuff. Garage Band is also a fairly easy learning curve and Lynda will teach ya
Seriously, I don't know if I have ever found such a great learning tool on the net. My wife and I have learned MUCH more about even simple programs like Excel and Powerpoint or Numbers, Keynote and Pages (again, brand new when I switched to Mac).
Avoid the frustration and the 18 pounds in paperback instructions Apple provides with Logic
LOL (Still some great stuff in their extensive library). Subscribe to a month of classes at Lynda and learn the right way right away!
J