Ahh Ingie it will be loads of fun..but halleys right if your not used to it it will take a little getting used to.
My best tip is get to know and love your 'command' key also known as the apple key its the one with the four leaf clover painted on it its used in heaps of shortcut key commands ,copying pasting printing etc....but the most important one to start with is 'command+ S' ..which will save your work. dont go trying to use 'control+s' as you would on a pc cause it wont save a thing
"I like to have a thing suggested rather than told in full. When every detail is given, the mind rests satisfied, and the imagination loses the desire to use its own wings."
~Thomas Bailey Aldrich~