I love my clipless pedals and stiff-soled cycling shoes, but I certainly would never recommend them to someone who is just (re)learning how to ride. I usually just tell people to leave the flat pedals on, or if it's a bike that doesn't come with pedals, to get a basic pair of platforms until you've got control of the bike down and can start and stop without issue. I'd also never put a pair of clipless pedals on a mountain or commuter bike, if I were doing a lot of riding in built-up areas. I'd stick a pair of BMX pedals on there and call it good...and learn to watch out for my shins!