Hi, Andrea. I hope these clarifications help you play the game:
· There's no pre-established amount of scenes or rolls that any mission should have. As the complexity of the missions, spontaneous situations, drawbacks and player's agency choices is a factor that is impossible to foresee. The only thing I can say, withouth knowing your group is that a "capturing a vehicle" is a single roll mission, considering that it may require things like "locating a vehicle", "positioning", "reduce armed threats", "taking command of the vehicle", "managing into a safe zone", etc. As for the players, as with any special forces mission, tasks are distribuyed among members as they require different actions (one of the Agents may force a door open while other watches over for impending threats). I recommend playing/watching the works of Reference and Inspiration that appear in the game.
· "Severely compromised" is not the same as "mission failed", but can lead to it. If your rescued prisioner is severely wounded, if your blueprints are stolen, if one of your teammates is captured...
· Missions are not failed after a set number of "compromises". Forget numbers, there's no HP, no Suceess meters, no Failure Bars, no % of degreee of sucess. A damaged escape vehicle is a damaged escape vehicle, a wounded soldier is a wounded soldier, may or may not be a condition to fail the mission.
· Problems created by Pressure may or may not require a roll depending on the Player's actions to solve the drawback. But normally the answer is closer to MAY than MAY NOT. Also, not necesarily ALL players have to roll on EVERY task considering that some may requiere a single person to act. Although, obviously, if you do nothing while being shot at, it's not recommended.
· Abou player's health. There's no Hit point system, no health bar. If you get shot in the right shoulder, you get shot in the right shoulder: you will have trouble moving your arm, pain will distract you, you'll have to stop the bleeding, you'll have to treat the wound to avoid infection, you may have to spend some weeks in a medical facility taking meds and receiving physical reahabilitation. In rules and mechanics, this may imply a Disadvantage when rolling, may imply a new "Problem" that need solving, be a condition for the "success" of a mission or, maybe even, be grounds for changing a character's trait.
Overall, I hope these may Edge Zero Force clearer. I recommend not to think the game in hard numbers, but rather think of it as framework of a movie.