Where to start?

Where to start?

I've been trying to get into the London Marathon since 2000, but have never made it through the ballot system. This time I'm guaranteed to get in as I've been rejected 5 times in succession. This gives the benefit of extra training time as people don't normally find out if they have been successful until late Novemember/Early December which is cutting it a bit fine for training for a marathon in April.

I want to do it in sub 3hrs 30Mins but this may be a tall order for someone that is 30lbs overweight and hasn't run seriously for more than a year. I may have some help though. A work colleague has asked if I want to go running at Lunchtime next week, nowhere far and hopefully not fast.