I'm twice the weight I should be.
I can jog, on the flat, for 60 seconds slowly, and 30 if I actually jog.
I'll take that though - these past few weeks I've been going out most days, then I seemed to hit some kind of stride last week, and went out twice a day (Not UK! once to try to jog, once to just walk) for 4 days - I did 50km last week!
Then I took Saturday off for my feet to recover, just did a long walk on Saturday, then yesterday I did my personal best - 5km in 48minutes. Still 10 minutes off pace, but unbelievable compared to where I was at before this all kicked off!
So my advice is, don't expect it to happen quickly. Pay attention to your body - if a knee twinges, or your feet are suffering, take a day or two off, or just walk (and don't pressure yourself for a brisk walk, just get out there for an hour to keep the habit), but if you keep it up, you do get there.
On the feet thing, what's revolutionised it is wearing a pair of pop-socks under my normal socks - having the pop socks as a kind of lube layer has stopped both my blisters, and the major foot ache I was getting (no idea why it helped with the ache)