I read this thread while i was doing my workout..
However I would like to add my 2Scents here.
first, you will see very little or hardly any improvement in the beginning, not before a month or even two.
Second, this is from my personal experience, start slow. dont rush, you will become tired and fatigued.
start slow, let the first five minutes be a warm up, let your heart rate increase gradually and your muscles warm up slowly.
once you finished the warming up period, you should be able to do a good workout.
I started out with doing one mile in 15 minutes, i now do 5.5 miles in 50 minutes.
also, you must be consistent, it will do no benefit if you just workout once or twice, it must be on a constant bases.
give it a few months, you will see major improvement!