If i were you i would use a stage name. John Wayne's real name was Marion Morrison. Use a shorter version of your name, or a nickname. I use fake names in my ads. When someone asks for Carl i know why they're calling. Carl is never available, but I am. Lots of marketers use stage names. Nothing wrong with it.
Post cards have an extremely low rate of callbacks. Yellow letters, hand written, are anywhere from 4-8%.
Never tried it. Do something that makes it stand out. Go get one of those 500 packs of kids star stickers and throw a couple of them on the outside.