1.
Here (.pdf)2. Nope. Generals are assigned regions on the map based on where they are in the real world, and then when you report a battle you decide where it was within that region (with a few exceptions I believe, such as official tourneys, but that's just based on something I only skim read). So example if I played a battle against my Ogre friend, we could put in the battle report that it was at the Giants Tump.
3. See above.
4. "Or do people just post a battle win at any location on the map they feel like?" The latter I believe - it'll be more like Medusa V than Storm of Chaos. The
second post here is rather good at explaining things.
5. In all honesty I don't know. Some battles may have a knock on effect in game mechanics, but I find it unlikely. Then again no-one really knows. However I do think that a cohesive lot of fluff submissions make it more likely that elements of "the plan" get mentioned in White Dwarf.
6. If there are any, which I don't know, I most likely wouldn't be able to say, however, since I don't, I am able to say that I don't know. That unambiguous enough?