Greek and I are training to do a marathon in Dec. I wouldn't classify myself as a runner. We did 10 awful miles on Sat - 90 degrees and very humid, not fun weather for running long distances. I still lift 3 days a week.
Avoiding injuries is key to long term training. Runners World website has a lot of good info on injuries and remedies.
Cheers
M22,H45,W45 S21/18D12 Retain faith that you will prevail in the end, regardless of the difficulties and at the same time confront the most brutal facts of your current reality, whatever they might be.