After 30 or more briskets in the last 5 yrs I can tell to plan about 1 to 1.5 hrs per pound @ 225 to 250.
I always trim the fat down and usually only season with salt/pepper/obion/garlic (SPOG)
Occasionally I'll inject with beef broth. Kinda depends on size and quality cut.
As for the crutch (wrapped at 150 to 160) kinda depends on how much of a bark you want and time. The crutch will shorten cook time but will leave you with less "crunch". I usually crutch because most of the people I feed don't want the heavy crust. Again personal preference.
I always let it rest before serving. At least a half hour. Since I usually crutch I will let it rest in foil wrapped in towels in a cooler.
Sauce I serve as a side. I myself prefer the brisket with nothing on it. But again that is a personal choice.
If cooked to the proper temp, 190-195 for slicing, 200-205 if more a "pulled" texture, it will be fine
Good luck and enjoy your efforts.