This site is being deprecated.
Please see the official X‑Plane Support page for help.
The default installation of X-Plane includes the B747, but not the 737, and the FMC has different commands mapped to the buttons than how they are labelled on the FMC. So it's probably not a great training device.
There is a freeware 737 available here. You could certainly download that, and the X-Plane 10 demo here, and see if it will work for your needs. You wouldn't be out any monetary investment that way.
This site is no longer being actively maintained.