Everybody is different, and I have often found that Plan A gets scratched by Life and Circumstance. I note that you are in your first year or so, and would simply recommend that you go out there and enjoy doing a bit. Focus on building up your weekly mileage tally, with a single long run once a week.
If GNR is your target, then you are clearly NOT after a stormingly fast age-graded podium place. Enjoy the atmosphere, practice running slowly, and preferably practice being in close proximity to other runners. Just build up the endurance to be able to do 13 miles in your sleep. A weekly mileage of 30 or so should be enough. Some programmes and plans are just too complex for beginners. I only have a training RECORD, and it doesn't really reflect anybody else's PLAN.
Here's some sneaky training slots:
-before the family gets up at the weekend.
-when Child A is at Guides/swimming/dancing/football. Taxi them whilst wearing your kit.
-any sneaky early finish from work - always have a set of kit in the car boot
-late night after tea. It won't be fast, but it's still miles bagged. You won't die, I promise.
-get young child to cycle whilst you jog along. (that's a hard session: you'll see)
-prioritise your day so that you defer some essential household jobs to times when training is impractical.
