Type "brisket rub recipe" in your favorite search engine, find one that looks like it will fit yor tastes and give it a try. Experimenting and learning what works for you are two of the best things about cooking BBQ. Good Luck and Happy Eating
If you are interested in a store bought rub, try http://www.smokingunsbbq.com/. They have an excellent rub. I use the hot version on my brisket. It is outstanding. Don't let the name fool you. Unless you are very heat sensitive, you will most likely find the rub to your liking. BTW this is a very popular competition rub.