Hi; welcome! A linear UVB (e.g. Reptisun 5.0) with an incandescent lamp for heat (both off at night) is probably the easiest and cheapest. Some compact fluorescent UVBs have caused blindness so they're generally avoided. A mercury vapor, like Powersun, provides both heat and UVB (that's what I have, in fact), but runs something like $60 a bulb and provides pretty high heat, so you'd need to rig something so the light would be above - not resting on - the cage. If going linear UVB + incandescent, 60 watts for the incandescent is common, and this can be just an ordinary lightbulb. If you go the Powersun route, I use a 100W.
If you want to be really fancy, you can go with a MistKing for watering; nobody really seems to like the HabbaMist. For one chameleon, that seems a bit overkill to me; a dripper on top of the cage that drips throughout the day, coupled with misting once or twice a day (depending on your humidity; it's getting dry in Michigan as the furness comes on) should be good. I had a live plant under the water dripper; the plant pot caught the water it didn't slop around.
Real plants are much better than silk; they help keep humidity up, for one thing. Pothos, schefflera (umbrella plant), ficus and hibiscus are chameleon-safe (they may munch plants on occasion). Unless you know you've got organic grown, wash the plant off, repot it in fresh soil (to prevent carry-over of pesticides), and (organic or not) cover the soil with something like river rocks so the cham can't accidentally ingest the soil. Sounds like more work than it actually is. Some artificial vines (like ZooMed bendy vines; there are other brands as well) and sticks give him something to climb around on.
Hope this helps, and welcome to chameleons!
