You probably don't need to use them but it depends on what you want to shoot.
You won't need the ND filters for anything you shoot with the drone for still images. The ND with a drone is just used for video, if you need that effect. Remember that when you put something in front of your lens, you are slightly degrading the image.
The PL filter can be effective but is dependent on the angle of the sun to what direction you are shooting. A PL filter will reduce glare but as I said, only when the subject and sun are at a certain angle. A PL filter can, when the angles of filming and sun to camera, are correct, remove that shine that the sun makes on water and allow you to see into the water.
It can also remove the sun reflection off a car windscreen that would allow you to see into the car. It can also make clouds pop and increase the intensity of a blue sky. It can remove the shine off leaves on a tree or bush and make for a more vivid green of the leaves.
It will probably be rare when you will be using them plus you will need to learn how and when to use them as well as know what adjustments you need to make to your camera settings. I would suggest you just leave them off and learn to shoot with the camera as is. Later when you know a lot more about your camera, you could try and play with those filters, otherwise you will just get confused and might have crap photos.