About MAVROS/MAVSDK

Hi , I started new project. I have to program drone to fly autonomous in warehouse for invertory management.I need GPS denied , Autonomous Indoor Drone with Gimbal camera. I have several questions releted that project.
1)What do you prefer MAVROS or MAVSDK or any other?
2) Which type drone do you prefer ? Do i need optical flow sensor?
3) Is there any tutorials for autnomous drone navigation?

Thanks for your answer.

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