Some things will vary slightly between species such as temperature and humidity.
You will want to well plant your cage. Here is a guide from these forums with the most comon plants we use: (and are readily available at stores such as Home depot or walmart
https://www.chameleonforums.com/plants/
You will want a basking light, a UVb linear tube (such as Reptisun 5.0) and perhaps a heat light (that does not put off light for night time when you will need to have darkness for your cham.)
I use 50w spot lamp bulb and 60w ceramic bulb, along with 24" reptisun 5.0 and a 2nd 24" tube (plant color regular florescent) for additional light, but it's probably colder here near the desert than in Tropical florida. You may want to put your lights on timers so you have one less thing to worry about.
Also, for humidity you will either need to hand mist several times a day or set up an automatic misting system such as the ones available form
www.Herpmist.com or
www.mistking.com. If you are hand misting you will probably want a dripper as well. You may need provide for drainage.
Food for thought:
Keeping a chameleon means keeping bugs. You will need apropriate sized insects for your cham.
The most popular feeders kept include:
Crickets
Dubia Roaches
Silkworms
and as a treat:
Hornworms
Superworms
butterworms
houseflys
fruit flys (for very young, small chams)
blue bottle flys
wax worms
in general the wider variety the better along with crickets or roaches as a staple
Hope that gets you started!