I have some Blender files that I would like to convert into obj files that I can open in Maya 8.5

I have tried to export these files from Blender, but the resulting file has nothing in it. Is there something that I am doing wrong, or that I simply don't know? I have Blender on my computer, but I do not know a lot about it yet. I know more about Maya since I am learning that software in school.

Any help here from you folks would be greatly appreciated.