Sexing them is easy - just look at the back of their back feet, where their heels are. If you have a boy there should be a tiny little nub there, what is called a spur, while a female will not have that. If you still can't tell just post photos of their back feet clearly and we will help you out.
As for supplementing them, you want to have a plain calcium (no phosphorous, no vitamin D3) for daily use. That's the most important one, and unfortunately most pet stores don't carry it so you might have to order it in but it shouldn't be expensive. Then you will need a calcium with vitamin D3 that you can provide about twice a month (depending on the brand) and a multivitamin (also for twice a month, depending on brand).
This should help answer most of your questions:
https://www.chameleonforums.com/care/food/
Take a look through that and if you still have any questions feel free to ask!
Congrats on the little ones!
these two both look pretty solid. The one is shy while the other could care less. Already eating too
