As Dean says, I don't think there are any specialist courses etc but depending on what aspect interests you, the following may be helpful
Actual flight simulation creation (Software)- A computer science degree with a strong base in Physics and Maths
Scenery/Aircraft/3D visualisation - A course or degree in 3D graphics/modelling learning to use a package like 3D Studio
Mechanical flight simulation (i.e. physically making a moving sim)- Engineering or robotics
In terms of getting a feel for it, FSX is great- Have a look at the SDK documents included with the Gold version of FSX and feel free to ask more questions about what particular aspect you may be interested in
