Question about how many fish I can put in my tank. (55g)

[Xyres]

So I have a 55g liverock/livesand tank and I was wondering how many fish I can put in there. These are what I have in mind so far:

-two clowns
-jawfish
-mandarin goby
-orange diamond goby
-cleaner shrimp
and possibly a starfish.

Along with that I already have some sea slugs that came on live rock and three hermit crabs, plus I want to add some coral and some anemones. Would this be too much? Also if I still have some room in my tank what would you add to compliment the fish i am looking at? Thanks, as I am still rather new to this.