Mouth breather
the most important thing is t be patient - do too much too quickly and you may get injured again.
For the first 4 weeks back, I would not try and gain anything - just ease into gently and don't do anything more than was scheduled. If by the second week of March you are fit and healthy and feel you are nearing where you want to be you could just add 5% in terms of speedwork and longer runs.
You have a month before you need to start tapering where there may be room for extra training but of course that is the peak period anyway.
The key thing is to be fit and healthy and being able to do the marathon rather than do too much now and not get there at all.