@FPS creator 4ever
Well if Wings 3D does not support UV mapping directly, you'll need to export to .obj then use a dedicated app to do this.
Texturing can be done in Photoshop, GIMP or any pain program.
Animations for FPSC can be created in 3DMax, Milkshape, FragMotion etc.
The best thing to do once you've textured your gun is download a EAI pistol gun rig and replace the gun model with your own.
I've modded a weapon which was a little tricky but no too difficult even for a modeller of my limited capability. I added a EOTech red dot sight with custom UV mapping and textures.