Originally Posted by
Zacchaeus
You want to export the player material to one module and your GM data to another. Export only what the players should see in a players module (races, classes, backgrounds, basic equipment etc) and as Moon Wizard points out tick the player checkbox. This will export the module with a green tick (when viewed in your data module activations screen) and means that your players will automatically see that module when they join your game (in their activations screen) and can load it. Thus the players see only what you want them to see.
I'm sharing the core rules books with my PCs. I'm guessing that takes care of all of the above?
The DM module should contain all the DM information (maps, NPCs, encounters, magic items, story entries etc). Export that module but don't click the players checkbox. Only you will then be able to load that module. And yes, you should only share images (including maps) as and when you need to and once you are done with them unshare them.