Hi, and welcome! I'm in a very similar situation to yourself. I am a runner and have recently started commuting. I highly recommend the clipless pedals, but also recommend good lights (I use the Magicshine MJ808E - front, Blackburn 4.0 rear). As for clothing I bought a cheap pair of padded leggings. Other than that I use my running jacket and base layers / running tops. These are perfect for cycling because of their wicking properties. My commute is 34 miles (round trip). I've done it in rain and shine. So far my clothing has been up to whatever the elements have thrown at me. Oh, and a high viz vest is useful - especially now that the days are drawing in. Happy cycling!