Fireworks photography requires some skill to get it right. However, unlike other types of photography, you rarely get a chance to practice fireworks shots, since it happens so rarely. With a still camera you need a sturdy tripod and a longer shutter speed in order to see the tracks of light from the shooting firework. You also will need to play with aperture, to get the best exposure. So leave shutter speed slow and adjust exposure via the aperture. Don't have too high an ISO or the dark area of the sky will be too noisy. Also since a single one can be boring, it is best to combine several shots by layering, into one image to really make a sky look full.
All this is far more complicated when trying to capture the scene with a drone. You might trying setting up to get the correct exposure for the average firework (since some are super bright and others not too bright at all) and then shoot video and try to capture a screen shot/single frame later, to the shot you needed.
Unfortunately it is not possible to give a clip and clear answer because fireworks shows are different with some huge things going on and others just small not too bright events. And sadly, we can't say go out and practice because there is nothing to use o be able to practice. It all happens on the night and you will need to be ready to adjust on the fly. The finale will always be the best part to cover but will also be the brightest. Therefore you need to be ready to adjust quickly to get the best capture.
One very important point though, be sure you know the wind direction just prior to the start and DO NOT place yourself down wind or all you will get is smoke in the sky. Be sure to be upwind of the show.