These are the fish I want for a 135 FOWLR
1 whitecheek tang
1 aussie tusk
1 porcupine puffer
3 clarkii clowns
1 cleaner wrasse
1 lepord wrasse
and possibly a leaffish if it is compadible
The porc will get too big unfortunately.
3 clarkii's could be an issue. Clown's a pretty territorial fish and do best singly or in pairs. As mentioned, mixing clown species can and probably will cause them to fight.
Leaf fishes are pretty fragile I believe. Putting them in a tank with voracious feeders might cause them to not get enough food. Fortunately you're in the right place as there are a couple leaf fish gurus on this forum who will know more definitively.
Leopard wrasses are the same story as the leaf fish. They're one of the more difficult species to care for (feeding and fairly sensitive to water quality). I'd hold off on getting one of those until you get a chance to learn about disease treatment.
Which tang do you mean specifically as there are 2 that go by the name whitecheek. Acanthurus japonicus (also called the powder brown) is the better alternative as it is much more hardy that the "other" white cheek, A. nigricans.
I'd imagine the tusk, A. japonicus, and pair of clowns of your choice would be just fine in your tank.
Definitely no on the puffer, and most likely no on the leaf fish and leopard wrasse.
As substitutes for those 2, look at the sharp nose puffers. They're little guys but have a lot of personality. Here's mine, named Toby.
Here he looks like he's smiling
As far as wrasses go, there are plenty of beautiful ones you can choose that are way more hardy. If you get a wrasse (including the tusk) get a top with really tiny spaces of it'll go carpet surfing.