Specifically the "Above" null (with all of the info under it) copy that one, then paste it as a new entry. Then rename it to "hangar" add 1 to the NumPoints line. so it should read 10 points. The null must not be inside of the mesh, and the above null is a good choice because of its distance from the mesh itself.
You will have to add the command points, and strike craft lines in the ships entity file. just look at the carriers entity file it is pretty self explanatory.
Or you can use a modeling program and add the hangar null that way. Plenty of info, and tutorials to sift through here. All you need to do is look for it. I know the no forum search function is a pain. Good luck on your project.