Don't bother with clipless. I like metal BMX style pedals for most of my riding. Haro Fusion 9/16 pedals are a cheap option. For layering, a poly or merino wool long sleeve shirt and lower base layer is a good start. A fleece vest and rain jacket can be paired with it as need for most weather conditions. If you are wearing normal pants, you will need to secure the cuff of your right ankle so it doesn't get caught in the chain. A set of USB rechargable lights will keep you visible. Don't bother with tracking miles or speed for a few months. Just focus on getting comfortable on the bike for an hour or more at a time.