im new to all this ,,,,

as part of my job i make 3d models of aircrafts in Mechanical Desktop/AutoCAD  or solid edge.

Now i want to bring these models in life by importing them in fs2004 ,,,,

problem is that i havent made any aircraft for any simulator before ... so i would greatly appreciate if anyone can help me in sharing any links for easy and biggeners tutorials or any help regarding making aircrafts for fs2004 .. i got lost in all the tutorials out there ... and dont know where to start

also i want to use the details models i have made in CAD softwares ... i can export them in iges or stl formats ... but dont know which fs2004 aircraft making software can import them and use them.

any comments
really appreciate your help