I need some help/advice with trailing edges and flaps to make a realistic wing shape. Also, when I use the tweaking tool to move flaps and load the level to test them, they fall off.
On the subject of dealing with wings, how do I prevent the actual wing components from not flexing when I put them in the fuselage blocks?
Exactly what deathtrsp said. Have a look at my fitter or Heyford for an example
Realistic wings require a lot of work. Everyone has their own way. The best way for you to learn is to download so highly rated planes, decide qhich ones you like the best and take apart the wings to see how they were made.
With regards to wing flex, you need to XML mod structural wings to allow control surfaces and also "disable collisions."
That being said, many people "fake" the visible wings and hide tiny modded wings inside the plane somewhere.
To stop the wing flexing you can use modded structural wings
First, built the wing, the you can use the fuselage to make those wings look like a more realistic ;-)