1) How do I rotate a spawned object (the road signs)? I tried typing in values in the Rotation box but only the last rotation parameter worked, and that isn't the kind of rotation axis I want. 2) How do I make my own signs (mileage signs, custom sized)? Or, if they already exist, how would I skin them?
The rotation in Torque3D isn't defined by XYZ euler angles, so what you're doing wouldn't work. Just use the rotation built into the editor. Also, by "make my own signs", do you mean how would you create them from scratch, e.g. in a 3d modeling application?
I can 3D model in Autodesk Inventor, but putting it into the game seems like the most daunting thing to do.
