Good Evening,
When you plug in your flight yoke does the program recognize it in the "options" section. Options should say...keyboard, mouse, and any peripheral controller you plugged in. If it does...then programming it is not too difficult.
If it appears, click on the yoke. then on the left of the screen there will some search boxes and a selection toggle for "assigned" and "all". Select All. That will show every feature that can be assigned in FS20. Once you find the function that you
want the yoke to do, click on it and an assignment box will appear...HOWEVER the easy way to assign your functions is to see that the assignment has a box with a question mark located at the top of the selection area above the Clear, Cancel and Activate buttons.
Click on the that box so it highlights (kinda a grey blue color) and then move or press the button on your controller you want to assign that function and it will auto populate the correct assigned button on your controller to the function you selected. Make
sure that you press the activate button and after making each of your assignments. Before leaving the options section, click the save button at the bottom of the screen. (it will ask you if you if you want to save before you leave)
When you get to flight surfaces, there are primary and secondary. For your ailerons select the function and... as I mentioned earlier click the box at the top with the questions mark. The joystick, or yolk side to side and it will assign the function (usually
Y or X Axis) and you will be able to move it side to side and see a visible slider below the function. If your joy stick or yoke is centered, in the neutral position the left half of the bar will show as white and the right half will be black. (You are centered)
If you push the joy stick or turn the yoke to the left the bar will progressively turn black as you move the stick or yoke to the left. If you push or turn them to the right, the bar will go totally white.
For your elevator, you will need to find the correct function and do the exact same thing, except you will push the stick or the yoke forward and backward for descent and climb. But the same function of the slider bar.
Hope this helps you get your peripherals working so dad can enjoy his sim. Like you, I wish there was a manual. I have done 5 hours of flying already on the sim, and I can tell you that once you get it all working, you will find it is an incredible sim.
I am a private pilot in So Cal, and I have flown to airports I have been to and they look almost identical to the real thing...and the ground references are spot on. I even found my apartment building.