I' be careful on the wireless cameras indoors. Just as easy as it is for you to set one up, its just as easy for someone that has a similar camera to take their receiver driver by and watch your camera from their car. then they can find out whether there's any activity in the house or not.
Those big screw in j hooks that are coated in plastic, screwed into a 2x4 which is then mounted onto the cieling. 2-3 of them to provide a pair of hooks for each pole.
You don't run Romex through conduit, you would run thhn. You would be able to mix the circuits in the conduit as long as you do not go over the fill rating as specified in the nec code. Metal conduit will be more up to handling any abuse that would be thrown at it, and also provides another...