Dont get discouraged all CAD applications have a steep learning curve.
I have been working on a similar project for a while now, take a look at the attached fuselage sketch it may help you get started.
I imported the fuselage stations image to set the location of the cross sections
Then I started to draw each cross section and placed them properly (this may not be the optimal way of doing it, but it works for me)
A detail of a rib section from blueprints
If you want, post some of the sketches you are working with and I'll try to help create the drawing and explain what I'm doing.
and as always I'm replying to an older post