After you finish, you get Power armor training, and a bunch of stuff. I haven't.done them all yet, but start with Operation Anchorage, the quest is 'Aiding the Outcasts' or something along those lines. If you finish the main story line, the game will be over, so don't do that. I'm not sure if it matters if I do that one last, or if I should complete the main storyline before i start any dlc. I know one of them continues the game after the main storyline. I just bought F3GOTY and i want to know what order i should do the dlc's in?