HELP! with fish selection

So I've ha my first saltwater tank now for 4 months and have to upgrade and have done so with a 55 gallon

I have no idea what to stock it with

I've had some people give me the idea of a reef system with :
1 blenny of choice
1 goby of choice
1 dwarf angel
2 o clowns
3 firefish
5 chromis
and a type of flasher wrasse

what does anyone think of this or have any suggestions for anything different

Thanks a lot