You aren't going to like this, but you can't breed your birds yet.
The female will be biologically, if not emotionally ready by 12 months. However, the male will not me emotionally ready to assist and care for them until he is also 12 months. You run the risk of abandoned chicks by breeding so young a male. A female who's male does not pay attention to her has three options. Risk the babies becoming sick and developing more slowly by leaving them alone in the nest in order to feed herself and return to feed them. Abandon the chicks altogether and try again at a later time. Or, starve to death in her steadfast refusal to give up.
You would be shocked how often the latter two things happen.
I can do this for you. It is possible to tell the maturity level (that is young, teenage, or adult) of a budgie by their eye color. Please send me a close up photograph of their eyes and I will tell you if they MIGHT be older than you think. If not, you should put this off until next summer, for the health and safety of both your current birds as well as the health and safety of their potential offspring.