You pretty much have it figured out with the long runs. My tip is that you run one every other week running progressively (not too hard).
For instance, every two weeks start at 2hr, 2hr 15, 2hr 30. The pace can be by feel, but I've had better success with easy for the first 4 miles, moderate to steady over the next 15-20 miles. I usually don't run MP or a specific pace, but I tend to progress naturally. The workout is in the duration, not the speed.
The other workout is a tempo of 9-15 miles at a steady pace. This will be somewhat close to MP, maybe slower.
3M easy + 12M steady, find a rhythm. What makes Marathon training way tougher than it needs to be is when people get too specific on paces. You are trying to generally accomplish running longer at a "faster" pace. Don't overstress the pace, focus on duration to get adapted to the demands of marathon training.
Good luck