For most of us who participated in athletic sports in high school, the competition stopped when we graduated. But team sports are just as fulfilling to adults as they were when we were kids, and a softball league is a great way to get people together for a little friendly competition. If you don't have one in your community, why not start one yourself?
The first thing you need are players, so start polling your friends and their friends for interest. You can also put ads looking for players in the classifieds or on community bulletin boards, and of course, there's always Facebook, Twitter and LinkedIn. You'll also need to find a good coach.
Once you have enough people to form teams, you're going to need a place to practice. Check out your park department or community center and see if they have field time for you. The more notice you give them, the better the time slot. At some point, you may want to get uniforms, but most adult leagues just have matching T-shirts with numbers on the back. Get some local businesses on board to sponsor you and you may even get them paid for.
You'll also want to start collecting equipment, like balls, batting helmets and bats. See if any of the players have some lying around that they could donate, and look on the Internet or in the classifieds for good deals on the rest.