Hi there! Behavior isn't an accurate way to determine gender, if you take a picture of their ceres (the area above their beak) in natural light with no flash we can help you determine their gender.
In terms of taming, leave your hand a comfortable distance away- don't try to approach them yet. It may take them a while to come to your hand to eat. If they aren't super motivated by millet you can try other treats like Nutriberries, safflower seeds, sunflower chips, etc. I would start just by offering their regular seed mix to see if that can entice them.
~Niko and Tetra~