I'm getting an undercut soon &tips about curling hair?

Your best bet would be to print out one of those pictures and show the hairdresser. That way they know exactly what you want it to look like. For the wavy bangs, sometimes a curler will provide too much volume. A straightener would be a lot easier to use, just go through your bangs like you are going to straighten them, but midway begin turning the straighter towards you to create the perfect side bangs for that kind of undercut.