grirc,
Here it goes:
1) Take the next 2-3 months and build up to running every day consistently, nothing but easy mileage.
2) After this move to a 3 day schedule with day 1 being a hard workout, day 2 and day 3 being easy runs. Ease into the hard days, don't bust a gut out of the blocks.
3) Utilize 3 type of hard days: tempo runs, speed work (intervals) and long runs. Alternate these.
4) Very slowly increase your weekly mileage adding 5-10 miles every 6 weeks or so (after first 2-3 months of building up on easy runs). Marathoning is about slow gradual improvement over a long period of time. You can't get there quickly.
5) 2 to 3 times a year take a 2 weeks of down time, with nothing but rest and easy jogging to refresh you mentally and physically.
6) Start running doubles (every day except your long runs) once your mileage exceeds 50-60 miles per week.
7) Once you've built up to above 70 miles a week, schedule 2 to 3 marathons per year about 18-26 weeks apart. Race a shorter race (10k to half marathon) once or twice between each marathon.
8) Goals: set attainable short term goals and mid term goals to help you focus along the way.
9) Ultimately you will want to get your weight down til your BMI is between 19.5 and 20.2
10) Your ultimate goal mileage will be in the 120-130 miles per week range but you will have to get there slowly over multiple years. No short cuts.
11) Remember each time you go out the door to run what the goal is for the workout and execute. That means if it is recovery then you need to run slow enough to recover. If you are doing a tempo run and you race it you didn't gain anything that day. You will not make great improvements in any one workout. Marathoning is about slow gradual callousing and improvement - it takes time, dedication and consistency.
Best of luck to you.