If the female is receptive.. leave them together until she turns non receptive colors and rejects the male.. it can be a few days... Or you can try a few sessions over the few days. Make sure to keep a watch over them so they do not injure eachother
Yes, I think these chams is too young for breeding. it is best especially for females to be over 1 year old and in good health before breeding
on the website we now have new thing have you seen it? @ https://www.chameleonforums.com/care/chameleons/