Good Luck with the new smoker and have fun learning it.
IMHO I like tri tip on the grill - have not been a fan of it cooked low and slow.
You can slice the brisket and freeze it just remember the that the smaller the meat the shorter the cook. Also remember that you fire up the whole smoker regardless of the amount you cook. It might help to put other things on while you cook your meat like ABT or beans. It is all about the experience of learning your smoker.