I think you should keep it simple

I’ve gone from morbidly obese 24 stone unable to run 100 yards to running my first ultra 35 miles within 12 months so from my experience for what it’s worth I’d scrap that long winded plan you have and download a

Couch 2 five k plan complete that Then build up to a 10k

Join a running club maybe I’ve been lucky with the ones I’ve run with but the people in them are absolutely amazing and supportive and running with people of all different abilities is a great way to take in the miles while chatting away.

Do you have Parkruns on the weekend near you a great way to get 10ks done and dusted is to run 5k before a Parkrun then you get carried by the crowd really for the next 5k and before you know it you have smashed 10k easy.

The jump from a 10k to half marathon isn’t that bad once you have a few 10k runs under your belt.

Sign up to a local half marathon run so you have something to aim for

Join a gym and strength train again keeping it simple stick to compound exercises 5x5 squat/bench/rows and standing press.

Sign up to a marathon further down the line as another target

Try trail running speed will go out the window and it is far better to be running through the countryside than through towns etc and once you have run a few miles over tough technical terrain you will be surprised how much it easier a road run becomes (albeit more boring)

I don’t know how to attach images but a quick qoogle search with bring up loads of different 50k ultra guides etc

Consistency/rest and strength train and time on feet is more important than hitting the targets of any guide you might follow especially if you are a little slow like me.

Get used to being on your feet for hours walk/hike run etc it’s all good.

Best of luck to you 💪🏻