Where will the PCs be based? How will resistance groups around the world communicate with each other? Can we do radio morse code, pulling out the excuse that it's too primitive of a communication method that the pantheons don't know about it? 

Will the survivor resistance groups have some basic weaponry and if so, what kind of weaponry? Do they have access to body armor? I suppose the resistance would have learned a trick or two to bring down the gunners in an easier manner and escape from the rest.