I am making my very first brisket - advice needed

I am sure you will get a wide variety of suggestions but here is how I would do it. Put it on around 11:30AM at 300. I would wait about 3 hours and wrap in foil and add beef broth (or what ever you like to wrap it with). I would check for tenderness after about 1 hour. It may be done or it may take longer. Wait until it probes tender, pull it off and rest in ice chest with towels to keep it hot (or cambro if you have one). Should easily hold a couple of hours, if needed. I would expect it to take about 4 1/2 hours or so but I give you plenty of wiggle room it is takes longer. Good luck!