Beginner salt-water aquarium?

I want to start a small salt water aquarium for my daughter. I am new to the aquarium hobby as I have only had 1 small fresh water aquarium many many years ago. I basically want 2 Ocellaris Clown fish (Nemo) and some cleaner shrimp. I have heard that a FOWLR is much easier than a reef and cheaper as well. My question is what size tank should I start out with for these 2 fish? Should I get a Nano Cube or get a regular tank and the equipment myself? How much will getting a salt water setup for these 2 fish cost? I have been doing some research and I know there is a LOT involoved in getting a salt water tank set up and maintaining it, but I do want to start it up as a hobby along with giving my 2 year old daughter Nemo fish to look at.