Making the fuselage is the most basic thing you can ever make in Aircraft Modeling.
Even I learned how to make all my models by reading the tutorials.
I suggest you put your little serious project on hold and start practicing with Gmax. Ya know, play around with it. Try seeing what you can do.
Whenever I have nothing to do, I would always go to Gmax and start playing around by making simple objects [box, cylinder, sphere] and applying modifiers to them. I would also usually convert the objects to an editable poly by right-clicking the object > going to convert to > and clicking whichever kind of poly I want it to convert to.
I would also usually play around with the Material Editor. This tool is what you need if you like to apply textures.
It took me almost a month to figure out the ALL the basics abd concepts of Gmax. And then it took me nearly 4 years to master it and push it to its limit.
In other words, I have 2 phrases to say to you:
1. You're in for a long training.
and
2. Practice, Practice, Practice.
For starters, go to
www.freeflightdesign.com and check in the Tutorial section [usually called Tips and Tricks].
The website also has a Gmax section that contains a fair load of Gmax files. These files contain just aircraft. You can use these as templates to see how most modelers make their aircraft.
My signature has a list of websites for you to chose from.
Good Luck