Hello!
Something you will love is the Option key. It gives you access to lots of characters that you couldn't get on a PC keyboard.
For example, you can get the copyright symbol (©) by tying Option and G. A bullet is Option and 8.
In TextEdit, go through the keyboard and find which keys do what. You can use Shift in combination too to find even more.
Accents can also be done this way. So to put a German umlaut (ü) on a letter, type Option and the letter U followed by the letter to have the umlaut.
Enjoy the Mac!