One of the most important things for you to understand is that these "stunning" tanks do not just happen overnight. It takes a very long time to build these reefs and gain the knowledge to maintain them.
This hobby takes a lot of time, patience...and money. You can do things on the cheap but it usually takes some experience to know what corners you can cut.
With all that being said...your fish selection is pretty good with the exception of the yellow tang. I would really not suggest a tang in a 55 and would not suggest a tang for a beginning aquarist. If you were just considering a FOWLR
tank I would suggest a dwarf angel such as a coral beauty...but if you are going to want to have a reef....that may not be such a great idea (though I have successfully kept a coral beauty in a reef).
If you are going to keep a reef you are going to want to figure out what kind of reef? SPS
? Zoas? Shrooms
? A garden-type reef? If you don't know what these terms mean..you have a lot of studying to do.
Your reef choice will also dictate what type of lighting you need to get. Three suggestions....
1) read, read and then read some more.
2) don't skimp on lighting
3) don't skimp on a protein skimmer