Hiya! Welcome to the forum!
Youve got a good start, though I wouldnt go too crazy on the tangs.
Is it a 5 or 6 foot tank?
Also, the mandarin will need a very very well established tank with lots and lots of pods
growing to sustain it. Unless you get an ORA one and it happens to eat prepared foods I would highly and strongly urge you to have him be your last fish.
Also, you want only 2 clowns, 3 clowns not a good idea. They will pair up and kill off the third wheel. And four clowns doenst work real well either, I tried it in my 125g and it was fine for a couple months, but then all heck broke loose and I had to remove one set immediately.
Are you doing corals ever or just fish? That will also determine what fish you can get.