When starting out you should take things very easy and you need to settle how many times in a week that you think you can run without overdoing it. I would suggest 3 times a week, which gives opportunity for plenty of rest in between. Rest is very important as your body needs time to recover and repair after periods of exertion. View rest as part of the overall training that you are doing. Never do 2 days back to back running in your early training - learn to rest, it will pay off in the end.
Get hold of a good start up programme and try and stick to it. It will seem hard at first, but it will get easier.
NB. It is important to do some warm up exercises before starting any running - this should be at least 5 mins. of movement to get your body mobile.
