Snakes are great. they are easy to look after, and if you need to go away, or go on holidays, you can feed them before you go, and don't need to eat till you get back. But some find snake intimidating. Really is up to you. I would say Costal Carpet Pythons, Children's Pythons, Inland Carpet Pythons, or Spotted Pythons would be the best to start off with.
I don't know much about lizards, but I think a Blue-Tounge Lizard would be a good starter because they are cheap, native, and resonably good to handle. But you cn sometimes get snappy ones.