If you just bought your machine, go to your local Apple Store and sign up for Apple One To One in store training.
Gives you a year of private or small group coaching sessions for $100.00
They had me up and running 1st trip.
I had already purchased Logic Studio 9 and was stumped by the learning curve.
Even if you've had your machine for a while, if you buy Logic, the store manager should
allow you to sign up, even though you are supposed to sign up when you buy your machine.
I took my interface, headphones, & mic with me and the trainer got me rolling on understanding the signal chain.
The program is also renewable.
They will train you on other applications too.
As far as general orientation also go to Macrumors.com and take advantage of their
beginners guides.
http://guides.macrumors.com/Mac_Beginner's_Guide