sure you can go get photo sources for your textures. I'd recomend trying to avoid simply taking photos from the web and slapping them on your model as-is.

I don't have a Mac so I'm not sure about your problem abstainer. Can you "Save File As..." on a Mac and save it straight to your computer as an .obj?

You may need to turn on the .obj plug in in Maya under Window > Settings/Preferences > Plug-in Manager