Buy the best grade of meat you can get...it always pays to buy Prime or at least Choice. On a brisket that small, I would consider a marinade. Get a Reynolds turkey bag; add a bottle of Wishbone Italian dressing, a cup of red wine, some powdered garlic and onion, and if you wish, some soy sauce and liquid smoke. Secure the top with a rubber band and let it sit over night in the frige. Take it out the next morning and add some rubb.
I smoke mine on a Big Green Egg, usually a full brisket, and my marinade consists of a sprinkling of sugar. I remove the brisket the next day, remove any excess sugar and add my own personal rubb recipe (available free upon request). I cook mine at 250 F until the internal temp of the brisket reaches 190/195. Takes a long time! Cooked on a smoker, the sugar forms a nice crust that keeps it moist.