Excellent guide! X Plane is a great simulator and i'm glad to see a well thought out and thorough starting guide.
For anyone that is intrested in getting into x plane but wants a payware non glass airliner experience I would suggest Flyjsim's B732
http://store.x-plane.org/732-TwinJet_p_305.html It is a joy to fly!
If you do pick it up I would also suggest the CIVA Navigation System add on http://store.x-plane.org/CIVA-Navigation-System_p_196.html with the CIVA Helper plugin https://forums.x-plane.org/index.php?/files/file/24566-civa-helper-plugin/ The pluggin is a huge time when working with the CIVA. The CIVA and Helper plugin can be used in other aircraft as well.