Hey, Welcome to the forums!
Please don't take any offense to the following.
I STRONGLY urge you to STAY AWAY from chameleons at this time. You're completely new to reptiles and while I have over 30 different species of herps, my chameleon is the most difficult species I own. I would try a leopard gecko for maybe 6 months to get the hang of heating, feeding and dusting/gutloading feeders as well as providing a great home for a specific species. Leopard geckos are VERY forgiving to errors and are probably one of the easiest lizards. I personally started with a pair of ball python way back in seventh grade. I just feel that there are so many things that can go wrong with chameleons that they become overwhelming to someone not used to trial and error as well as setting up different animals. We don't want you scared away from the hobby before you've begun. For instance, after I got my argentine black and white tegu, my argus monitor is a breeze but it's still a difficult species.
You said you want a tame animal. I don't recommend handling your cham unless it is necessary to do so. I just feel that you may be looking for qualities in a cham that you'd be more likely to find elsewhere, say, in a crested gecko. They're easy and will tolerate handling quite well, and are fun, arboreal lizards that fire up and change color nicely.
I just suggest more reptile experience before jumping into chameleons. I don't think your age is an issue in the slightest given you're dedicated, and you seem to be since you're doing research BEFORE buying the animal
You could very well prove me wrong and go right ahead and buy a Parsons (lol, don't do that.....) but I'd personally take things slow.
Just my spill on the subject, and NO OFFENSE intended!
Message me if you want a list of good starter herps/care info. or if you have any other questions.
Danny Sternfeld