L3O Horizon Game

I started a game on the defaults - story mode, missions, and tutorials. I'm not sure what the default difficulty is because I can't find the setting to change it. (Is it hidden, or am I blind?) Thanks for the pointer to the wiki, there were a few things there I hadn't figured out yet. It doesn't app...

Are there any guides available covering basic strategy/gameplay/etc so that I don't get 5 or 20 hours into my first game and realize I need to restart because I massively screwed something up?