The caresheets here are definitely the best place to start getting your information. From there you will get great ideas and the knowledge of some very experienced keepers. My advice to you is to make sure you stick to a solid routine for gutloading your feeders, and dusting with the right supplements. This can give your chameleon the nutrition necessary to do well in captivity. As for fruits and veggies, not all chameleons will eat them. You will have to experiment with different items, but just don't over do it with any one item. Variety is generally the best. I tried strawberries, but my veiled doesn't even go near them. Small carrots, kale, romaine, apple all seemed to work in small doses. Proper lighting is very important for prolonged success. Tons of information about UVB requirements as well as basking bulbs. Use the search bar and get some great ideas and advice.
Most important thing to remember is that chameleons often will not show signs of anything wrong until the problem is already serious. You need to practice great husbandry techniques to have a better chance for success, but there are no guarantees.