Here is what I have done and would do:
1.Get learn and use the Litchi App's Waypoints to pre plan your 3 missions so your videos are smoother. Litchi lets you program at your desk then upload and fly the mission (flight) when you are ready without the drone being on.
2. If you are near any airports get permission from the tower (call them) then use the DJI website
Self Unlocking - Fly Safe - DJI to unlock your drone for that restricted zone. You will need you controller's serial #
3. Get and use Powerdirector editing software to do your editing. It's relatively inexpensive, powerful, and an easy program to learn and you can easily link all you videos, create slow motion in certain sections, add titles, etc. If you are going to do a lot of video editing with your drone (which you will) you need a good editor.
4. Go slow with all movements during your videos especially turns. If you fly FPV mode limit your turns to about 5mph or you will get a lot of "judder" which makes videos annoying to watch.
4. In Waypoint mode set the max speed to 5mph, use curves for the corners (a setting in the setup) so with the sticks not being used it will go around a corner at 5mph. When going straight you can override the max speed using your stick but when you let up it reverts to 5mph around the corners.
5. The goal is Smooth Videos especially around corners