If you are injury prone, a training plan might be the worst thing for you. I think a lot of runners get injured during marathon training because they feel more obligated to stick with the plan than to listen to their bodies and get adequate recovery and avoid over training.
Also, with your poor mileage base, your main challenge is going to be endurance. And your training should focus on endurance (marathon pace miles, long runs, mileage).
Here is a simple plan that I have followed that you can adjust as needed
Week A: Marathon pace workout, 4 mi at mp, progressing to 10-12; easy long run 16 mi progressing to 24
Week B: Shorter, faster stuff (5x1200; 4xmi; etc, at 10k-1/2 marathon pace). Shorter long run with marathon pace at the end. Start with 14 mi w/4 at mp and try to progress up to 18 w/8 at mp.
One workout a week is probably enough. If you feel good, add some hills for your form and strength. Try to build as much easy mileage as you can by running much slower that your usual easy pace (as slow as 8:30-9 min mi) and pick up the pace once you feel comfortable.
Frankly, your current times indicate that a sub 3 marathon will be tough. However, your old times indicate that it may just be a matter of regaining some old form. Just be honest with yourself and focus on the miles.