impulse buys are not a good idea especially a cham. But I will not berate you since you do now have a little one you need to provide for. Do you have any idea how old it is? How big is it? Did you get it at a store or show?
They can overheat very easily so monitor your temps carefully. What sort of cage do you have it in? Go to link below (Cham Resource) for links to lots of cham info. A specific article on babies is here:
baby care
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Chameleon Help & Resource Info
1.0 Nosy Be Panther Chameleon - Cyrus
0.1 Veiled Chameleon - Luna. She's now hanging from her big jungle gym in the sky
1.0 Beardie - Darwin
1.1 Side-blotched lizards - Ana and Stan for now 
0.2 felines - Kyndra and Lita
0.1 African Clawed Frog - Skippy
0.1 Chilean Rose Hair Tarantula - Rosa Leigh, Died 4/21/06 
0.1 Goliath Bird-Eater Tarantula - Natasha, donated to science 4/4/06
?.? Pinktoe Tarantula - no name yet