first things first get some proper running shoes, ideally fitted from a proper running shop but for casual running you can get decent pairs from sports shops. Asics, Mizuno and New Balance are all good brands for running shoes, I wear adidas 'cus I've got wide feet.
Start off gently, maybe round a local park, jog at a pace at which you could have a conversation and stop whenever you want, although don't actually stop, just walk.
I usually run for about 10 mins, then have a stretch, before carrying on, although my grandad who's 88 and is today entering the Liverpool half marathon never stretches so that may depend on how you're feeling. Take water if you;re going far enough.
Basically, don't over exert yourself early doors, you want to be enjoying it, so maybe choose a nice sunny time to start.