The thing is, what works for one chameleon in one situation may not necessarily be the ideal diet for another chameleon in a different situation. It depends on a lot of factors, especially if we're coming down to supplementing, amount of food, feeding frequency, etc. Even within the same species these things would differ between the sexes. So it's not a simple answer.
This resource definitely provides a good platform to start:
https://www.chameleonforums.com/care/food/
If outlines the best feeders and the best types of food to use for gutloading.
You can order bugs confidently from any of the forum sponsors, they will all sell insects in bulk and ship them to your door. A good tip is to order a size smaller than you really need, so that they do not outgrow your pet in the weeks you may have these insects and so that they live longer.
Superworms are an awesome back-up feeder to have. Very low maintenance and they live for months. Roaches are the most cost effective and nutritious feeder to breed yourself, so it's worth investing in a colony of something like dubia or discoid roaches.
How you keep the feeders you buy will depend on what you have. Typically, a large plastic tote with proper air supply (like screened-over panels on the top and sides) and lots of egg crate. Then just feed with the recommended gutloads and keep it clean. The cleaner things are the fewer feeders you will lose.
I forget if the resource link mentions it, but there are many great commercial gutloads as well. Repashy Superload and BugBurger, Cricket Crack, Dinofuel, etc. Many of the forum sponsors have at least one of these for sale. These could substitute fruits and veggies completely if you don't have time or it's just one of those days, but for the dry mixes you'll still need to provide the bugs with water.
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And now, as for me personally, on a normal week I will rotate around crickets, 2-3 different roach species, and superworms. At least once a month I will order in hornworms and/or butterworms as well and mix them in. The amounts vary depending on whether I'm feeding my huge Meller's or one of my baby panther girls, so I couldn't give you a set schedule. But I mix aorund the 5 staple feeders so that they're always getting something different.