I definitely found the couch to 5k programme a good way to start. The only thing is that if you're already fairly fit it may seem a bit slow to you, depending on how accustomed you are to cardio exercise. So I'd say, feel free to build up a little more quickly than the C25K suggests - with the proviso that I also agree with the previous commenter about not doing too much too quickly!

Other thoughts: running every day can be tempting in the beginning, but probably isn't a great idea for your body and muscles.
Running outside is 100% pleasanter than running on a treadmill, as long as you can find somewhere without too much traffic but where you also feel safe.

Have fun!