As others advised, start to learn the ME (Mission Editor). I started as you do, and went from zero to hero. Now i have my template missions for training in NTTR map with random air traffic, IADS, Jamming script, and practice target area with mod objects.
Take your time seeing ME tutorials. Start creating simple missions so you can get the grip of ME.
As alternative you can search DCS user files site for training missions created by talented users.
Enjoy.