Since the title of this thread is "How to make an aircraft", making an aircraft can be done in several quick steps:
Copy the folder of an existing aircraft to another folder. Rename the folder.
Rename the aircraft-set file in this folder: this is the name used to select the aircraft FG starts with.
Create a new 3D model (Wings 3D is easy to use) and export it to .3ds or .obj format (Wings 3D does not export to .ac)
Create the flight model file using tools such as mentioned above.
This model will have no animations or textures, but it is a start, and you can refer to the Wings 3D manual or updated how to files in the Wiki (I may have to write this myself).
Please don't give up: that is the main thing. Blender is hard to learn and use but the newer versions are better. F Wings 3D is much easier.