Congrats on the Mac and enjoy it.
Give yourself time to get used to it. I'd suggest downloading one of those Switching From Windows to Mac documents (there are some on this forum, GGJstudios has posted some, for example) and keeping it on your desktop so you can consult it as you need to. Learn the keyboard short-cuts - Macs and Windows computers do much the same thing, but the actual commands to do so may differ.
Edit: Simsaladimbamba has just beaten me to it with a link to GGJstudios' reference; thanks; to the OP, download this onto your desktop and use it as a reference, it's excellent.
Cheers