Sweet Jebus!

Friendly round here ain't it?
Answers!
1) When you start a career in GWX you start before the onset of war. That's why everything is labeled as friendly (i.e green). This was done to simulate a 'shake down cruise'.
2) Press M
3) GWX is still only an expansion over the original Game and that original game has unfixable bugs. Assigning grids that don't exist is one of them. Just pick a grid and do your own thing.
Lastly,the GWX manual is included with every install. Either as a link or within the Documentation folder.
Happy hunting OP.