I'm a Northern BC resident, and I am a stone hunter. And there are some places with some really bad blood between outfitters and residents. THAT would be my first question.
And asking who has had bow hunters previously, and has terrain conducive to bowhunting would be right up there as well. Have to remember that outfitters can sell as many sheep hunts as they want every year, but they are only allowed to kill up to their allotment quota. In some places a bowhunter is simply an extra $35-50k where they don't have to worry about him killing a ram that would have otherwise gotten a repeat customer because the terrain simply won't let you get close enough.....
If you are open to rifle hunting them, then figure out what your personal limitations are and go from there. Scared of horses? Scared of ugly steep trails and deep fast rivers while on horseback? Scared of scary steep ground? Not in shape? Scared of light planes? Have time limitations where you would have to be back by xxx date or lose your job? (That one is a big deal, I know more than a few guys, and have personally spent extra days, waiting for the rivers to go down enough to cross "safely").
If you don't have any personal limitations, then roll with the questions around sheep densities (are you going to see lots of sheep - ie ewes and lambs and only a few rams), quality of rams taken (whats average length and base - big difference between 12" bases and 14"+ bases and 34" curl vs 40" curl), harvest success rates (ie 80% of our hunters had opportunities at rams - but they were all under 36"... or 50% of our hunters killed rams over 38"). Ask about age classes - are they killing predominantly 8yr old rams? Or are they killing 12yr olds? If they are consistently killing old rams that will tell you volumes about pressure and sheep densities.
If you can track down Clay Lancaster on social media (I would be pretty surprised if he wasn't a member here actually...) he is a pretty good guy to talk to and straight up.