Chameleons please help!!?

okay so i have a 10 gallon tank, reptile carpet, 2 wood hides, water bowl, humidity gauge and temp. worm bowl and under the tank heater... i really want one of those small green chameleons at pet extreme.. what else might i need before i get one. in the tank now i have a dying leopard gecko baby.... :{ i love her... i also have 1 beardie,, had one other one but he died of old age.. i rescued him when he was very old.. his last few years i made great :) RIP- chewbacca..... anyways let me know what else i need to get thanks!!!!