The brisket is one of the more difficult or tricky pieces of meat you could've picked. I'd recommend a pork butt, a fattie, chicken quarters or a slab of ribs. The butt will likely take the most time, but is pretty forgiving if you're chasing smoker temps all over the place. And will give you some tasty q. Fatties are a fast and easy cook, well depending on what (if anything) you fill them with. Chicken quarters are cheap, and cook pretty quickly and taste great. And ribs, well if you can keep your smoker temps pretty consistent, it's one of the staples of BBQ. Follow the 3-2-1 method to start, then start making your adjustments everytime you cook them.
If you're a beef fan. I'd recommend a chuckie. IMHO it's nearly as good as a brisket. But is a quicker and easier cook.