This site is being deprecated.
Please see the official X‑Plane Support page for help.
The PlaneMaker tool is included in X-Plane’s main folder. The manual can be found in the “Instructions” folder. There are plenty of tutorial videos on YouTube, e.g.:https://www.youtube.com/playlist?list=PL83BC4217746786FF
Aircraft in X-Plane are modeled by breaking down its components into “elements”, and then calculating the forces acting on each element. You may find the tweaking process to be more involved than you have with FSX.
This site is no longer being actively maintained.