Until you're ready for clipless pedals (with cleats that attach the shoes to your pedals) you could get away with a cheap pair of tennis shoes - like the old Keds, or the knock-off that Target sells. However, I found a pair of Diadora shoes that worked best - they had a stiffer sole than the tennies, but still had a low profile that would fit, and the sole wasn't too slick, or too grippy. I'll see if I can find a pic.