DON'T buy the gecko displayed on pics. It is close to dying, and kept under totally inappropriate conditions. Seeing one staying on the floor is never a good sign, and it looks fairly dehydrated.
You can obtain captive-bred Ptychozoon (kuhli or lionotum, both species are very close to each other and are to be kept exactly in the same wy) by browsing classifieds here and there. This means much, much less trouble than buying WC ones for a tad bit more of money. Imports come in droves from Java usually, they always arrive dehydrated and with both red mites and internal parasites. You don't seem to have enough experience to deal with such animals, so better buy CBB ones.
They are arboreal, territorial, nocturnal and quite fast, with flattened bodies. You need an escape-proof enclosure, as high as possible - 2 to 3' high at least with a fairly large floor surface as well as these guys will jump from one side of the enclosure to another. They like more warmth than most gecko species with a basking spot in the 95-100°F range, females will bask there when gravid. Night temps of 75-78, cool end during the day around 85. Frequent, at least daily, mistings are required. They love bamboos placed both horizontally and vertically as perches and cork pieces as hides. I use large water dishes for them as they will drink from them a lot, especially when arriving dehydrated. CBB ones are rock-hardy critters, I do not recommend handling them as they will stress out a lot, try to escape and bite you. They really are escape artists if the enclosure is not properly set up...and climb walls and glass as well. Still, they are fantastic display geckos with good appetite - subadult crickets will do as a staple diet, dusted on every feeding with Miner-All I, feed them 2-3 times weekly when they are adults, more often with juveniles. And again, DON'T buy the animal on the above pics!
Hervé