I'm getting a baby whites tree frog and have a few questions.

1. How often should I dust its food with calcium+d3 and multivitamin when its a baby/growing and also when its fully grown. And how many insects should I be dusting?

2.If I put crickets on my hand every time I feed it from when its a baby will it eventually automatically jump onto my hand expecting food? I would like to train it to jump onto my hand when its hungry.

3. What are the typical signs of both genders in a young frog because I want to get at least two and would like at least one male and female. I know its difficult when they're babies but an educated guess is better than and only picking.