Over the years I've learned that the answer can become self evident if your frame the question correctly. It turns out there is a simple procedure to follow to using the mission editor (however, the mission editor can also be used to produce complex missions). Here's what I got (and if I got it wrong, please let me know):
1. Select Mission Editor on the start screen;
2. Select a MAP on Mission Editor screen (the number of MAPs available is based on the number of MAP Modules you have acquired);
3. Click on the "Aircraft" Icon on the left of the Mission Editor screen;
4. Place the aircraft on the MAP in the area where you want to start your flight / mission;
5. In one of the boxes on the screen you set "Type" of aircraft (the number of types of aircraft available is based on the number of aircraft Modules you have acquired or community aircraft you have loaded - another subject entirely...) [I normally pick F-18C Lot 20];
6. Select "Pilot" as "Client" or "Player";
7. Select desired "Callsign";
8. In another box is a "route" symbol and from there you can select specific start location...ramp, a specific parking space, airborne, etc., etc.;
9. In the same box is another symbol for "loadout" where you set your fuel on board, armament / weapons and livery; and
10. Back to the left of the screen is a green circle with a check mark which you select to save and name your mission.
Once your mission is saved you will be magically transported to your aircraft and can fly depending on knowledge of DCS and the aircraft. For example, I don't know all the start up procedures for any of the aircraft, so I rely on "Auto Start" (bind one of you keys / control buttons to "Auto Start" and another to "Auto Shutdown"). If you selected to start your mission "airborne", you may already be Auto Started, I do not know.
Based on all the boxes and check boxes in the Mission Editor screen there is much more that you can do.
Here is a link to a good article about using the DCS Mission Editor -
https://letsflyvfr.com/how-to-master-the-dcs-mission-editor/ .
The article also has an example mission for you to set up which allows you to practice both using the Mission Editor and flying in DCS.
As I work through some of this stuff, I will update it here in the DCS Forum.