Here's a link to creating the card:
http://forum.xda-developers.com/showthread.php?p=23153010#post23153010
Nightly builds of CM10 can be found here:
CyanogenMod Downloads
These gApps should work:
Techerrata Downloads - Downloading gapps-jb-20121011-signed.zip
You should read the first link for instructions, but i believe all you need to do is create the card, DL the files, copy them to the card and boot off of it with your NC. The first boot will take at least 5 minutes so don't panic.
You want a Sandisk class 4 (or class 2) card for best performance. I'd use at least an 8 gb card, bigger if you plan to move some media (movies, music, pictures) to it.