The post above should have you covered. Other than that, buy a Logic Express book, read it all the way through (there will be a lot you do not understand, but read it, completely and with full attention anyway), and then read through it again this time doing everything with the program as you read.
This will take you less than two weeks doing it an hour or so a day, and you will be flying by day 14.
I converted to my first Mac with Logic Pro 7, and had almost torn all of my hair out trying to get anything to work from PC/6. I got an OS X Bible and a Logic 7 book, did exactly what I said above (although for about 10 hours a day, every waking moment not at work/school at the time) and never looked back.