Making basic missions is really easy once you understand the editor so I suggest that you learn the editor, it's not hard at all.
1. Start the editor and press the ok button when the coalition window appear.
2. Select the aircraft button to the left
3. Choose a point on the map put the pointer over it and press the left mouse button, choose another point and press the left button there. This makes the aircraft go from point 1 to point 2.
4. Choose the aircraft type, speed, altitude, loadout, AI or player contol etc. with the controlls to the right.
5. Set up an enemy flight/ground unit in the same way as you set up your fligth, but select a country that is not in the same coalition as you.