How can I export 3D geometry object/scene, camera and textures to a .3DS format? I tried importing the file I created into 3DsMax but it didn't work properly.
3ds is a deprecated file format. Try to export the scene as FBX 6.1 ASCII - this should work immediately. In some cases you have to play with the settings, because it depends on your 3ds max version and your installed fbx plugin. Also see the wiki for the current state of development.
Suzanne in Blender 2.73a
Suzanne in 3ds Max 2012