John Elway has posted a help-wanted ad for a quarterback. Only adults need apply. Who’s the next quarterback of the Broncos? “Going into it, we don’t know,” Elway said, when I asked him whether we should expect the quarterback for Denver in 2018 will be an experienced veteran or a raw rookie. There’s no easy button for Elway to push. When the Broncos go looking for a quarterback this time, there’s no Manning coming to the rescue (sorry, Eli). But if Elway is serious about getting back to the playoffs in 2018 and really doesn’t want to fire coach Vance Joseph 12 games into next season, isn’t the choice obvious? The first place the Broncos have to look for the answer is a quarterback with NFL experience. Three-year rebuilding plans more often end with pink slips for everybody rather than a Super Bowl parade through town. Elway hates losing, so why would he have any patience for it? All the rules in the pro game are tilted in favor of the quarterback. And all the Broncos know for certain is if Trevor Siemian, Brock Osweiler or Paxton Lynch is their No. 1 quarterback next season, they’ve got no shot to win. “There is no doubt we have to get better at that position,” Elway said. “For us to have a chance to get better, we have to get better at that position.” So let the debate begin with NFL veterans Kirk Cousins, Alex Smith and Case Keenum rather than college prospects Sam Darnold, Baker Mayfield and Josh Allen.