Going out for a run is easy. An aspect of running that I love is that I don't need any special equipment. With just a decent pair of sneakers and some sports clothes, I can just go out the door and get my daily run wherever I may be.
The problem, of course, is repetition. For running to become an integral part of your routine you need to make it a habit. But habits take time and consistency to build. And there will be off days. When I started on this journey my mind would make all sorts of excuses. Some days my legs would hurt, others it rained, others yet it was windy and cold. My mind tried to trick me into not going out and stay on my cozy sofa.
But I had a goal: run 2 miles or 25 minutes at least 5 times a week. And I had an accountability partner (my wife) who would push me out the door when I started to whine about being tired.
In the end, everything came down to taking it one day at a time and following Murakami's advice, to miss one day is OK but "never miss two days in a row".
So to start pick a very concrete goal, add accountability, be patient, and get out the door as much as you can. Once you're out your legs will instinctively know what to do.