Hi there and
to the forums!
Your budgies are very sweet
The grey coloured budgie is male and the blue and white pied is female
Males have pinkish or purple ceres as chicks which mature into the royal blue colour in most mutations except for albino/lutino, recessive pied and dark eyed clear, in which their cere keeps the immature colour. Females have light blue, whitish, or tan ceres that turn brown when they are in breeding condition, and then revert back to the original colour.
You've been given great advice so far, and I agree completely. It's very important you learn how to care for budgies properly first, and then start building the knowledge necessary to breed. From what you've said, you seem relatively new to budgies so I hope you'll be taking Deborah's advice into consideration
If you have any questions after reading through the links provided, please do ask! We'd be happy to help you
I hope to see more of your two budgies around here!