Only stupid questions around here are the ones not asked!
There is no definitive answer to any of your questions. All is relative.
I've never tried the CS brisket rub but I'll bet it's good.
Some dust a brisket while others lay it on heavy. Some put it on the night before and let it penetrate further while others put it on just before the smoke.
Some masage it in and some, like me, just sprinkle it on and let it sit for a while.
Half the fun of BBQ is experimenting!
Take good notes of what you do this time and adjust & tweak next time. When you finally find something you feel is a knock-out winner, post it here
Hope this helps a little.
Looking forward to hearing about that first brisket!
BTW -- Take a look at
Mainely Dave's website. about 2/3 the way down you'll find his notes on brisket.
Might also want to look at
Smokin's Brisket 101. Good stuff!!!