If you decide to start jogging I already posted my opinion on another thread titled:
Learning to Jog!
So check it out if you would like some tips for starting, or just search my posts, which might be easier.
Good luck with your training! And...do not think about the worst things that can happen...it will discourage you...Best to start off slowly and be conscious of what your
body tells you while you jog/speedwalk (or do any other form of excercise).