hi brendan
The easiest way to do it is
1) in metesaqoia select save as and then save file as Plane name.X (direct x format)
2) copy a par file and wav file from a similar type plane rename them the same as your X file
(At this point model should fly in fms)
3) edit the parameters of par file using notepad or word the web link i posted, is for translation and explanation of what each line represents.
http://home.introweb.nl/~erics/fms/par.htm
(only change 1 or 2 PARameters at a time)
4) make sure all files are in the FMS/MODELL folder
here is a great source for models and PAR files
http://www.rc-sim.de/downloads_all.htm
Thanks for the comments on my truck.