Here are 10 things you need to know about the Dallas Mavericks before the season begins:1. Dirk's futureHow much longer will the franchise icon play? He might not even know himself. Nowitzki said he's made no decision about his future, which is completely dependent on his health.What we do know is that he's on record as saying that if his body holds up reasonably well this season and he's having some fun with all the kids around him, then he's open to playing the second season of the two-year deal he signed this summer."If I miss another 30 to 40 games in a row, then obviously, it's not meant to be," he said in the offseason.