If you are a novice don't try to draft, it's an art in itself. Hang back at least 6 feet. If you do draft let them know and ask if you can try a turn upfront. Though a paceline in commuting is dangerous. As you get older you may need to get a "faster" bike to keep up with a puppy on a Huffy. Lots of etiquette and unwritten rules to riding a bike at times.