Congrats on your decision to start running. I ran my first 5K a few weeks ago. I have been running a few on my own since then. I also have signed up for a bunch more this year, one of them being a mud run and a color run. I was recently at an outlet mall and bought myself a bunch of nice running shorts, shirts, socks and jackets. It felt awesome to treat myself. I never thought I would become a runner, but I have to say I am hooked. Although it wasn't necessary I bought a subscription to runner's world magazine, and bought: Runner's World Complete Book of Running: Everything you need to run for weight loss, fitness, and competion. A great book with tons of useful stuff in it. I also wear compression gear when I go running or use the eliptical. It helps keep all the jiggly bits in check. Don't forget when you are out running, you are lapping everybody sitting on their couch!!
All the best!!!