Get acquainted with the F buttons. Take advantage of the zoom in feature you have, and the "print screen" is interesting (you might need some time to get used to memorizing it though, apple-shift-4 to select a specific part of the screen or apple-shift-3 for the whole screen; it's the four that makes it interesting). If you have a Macbook, the one button thing is actually better imo. You use two fingers on the mouse pad and the button to right click. It seems to me more convenient than going back and forth on buttons. I haven't used a "desktop" version of Mac yet, so I can't judge you on that one.
Remember to let go of all your Windows addiction to the "ctrl" button and use the apple button instead.
And one other thing. Unless you're absolutely desperate, don't install a "Windows compatibility" software into your Mac OS. If you must, split the hard drive and install windows that way, so that if you do get a virus, it infects only that part.
And never fear. There's always something compatible with Mac that you need. It may require you to add the word "mac" to your google search if you must find it.
And have fun with your easiest-to-use, pretty-darn-fast computer.