Our expert says:
it's perfect for a start. What you'll find is that your fitness will imporve and you the first thing that will happen training wise is that you'll be able to go further in those 30 minutes than you did at the start. That's step 1.
once that happens, then you can increase the time. Instead of doing 3km in 30 minutes, try 4 in 40, and gradually increase the time you spend training. Let fitness dictate this - you don't want to arrive home feeling spent and exhausted, so don't force that increase until you are ready. Aim for "invigorated" for now.
As for a programme, you can try these: http://www.health24.com/fitness/Programmes/16-1347.asp
There are a few walking programmes there, start with the first and work up to where you feet take you!
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