Couch potato to marathon in under a year

I want to run a marathon, and so I'm going to. It's a little embarrassing even bringing it up to anyone. I keep thinking about what's going through their heads when I tell them. A marathon? She's huge! or Haven't you got enough on your plate already?
I've been longing--searching--for something for a long time. It didn't click until now. I think it is human nature to want to be more, to test your limits. And that is why I am going to train for and finish a marathon.
Why is this so significant? Because those who are even fit sometimes don't even fathom running a marathon. I am 238.4lbs, and at only 5'10", I am obese. Sure, I had a baby 13 weeks ago, but I am definitely in no shape. So that's why I'm starting slow.
There is a marathon class offered every few years at the University of Northern Iowa that is world-renowned. It is very hard to get into, so I bought the book based on the class. The Non-Runner's Marathon Trainer, by David A Whitsett.
Before beginning my official training program, I have to get to that level. I walked today for 12 minutes at a pretty good incline on my treadmill at 3.0mph. I really need to get different shoes--my toes go numb. I read that's probably because of the small box on my shoes. I'll have to go to The Runner's Flat in Cedar Falls for some shoes. They can video tape how I run and fit me for a good pair of shoes. I just have to get the courage to go in there first. Isn't she a little too fat to be training for a marathon? I added one of the owners on my Facebook. Maybe I'll send him a message on there in private and explain my situation. After all, he probably is fully aware of the marathon class and the book--since UNI is right in Cedar Falls.
The little bit of walking today has me worn out. I have a blister from my ill-fitting shoes. I should go to bed now because there's a huge winter storm going on, so I'll have to leave much earlier for work in the morning. I must get more sleep than I have been! Damn internet...
So, for now, bye bye!
Kate