As mentioned above, you should NOT ever even think that breeding your budgies (with no breeding experience) will somehow produce budgies that are hand-tamed.
You've been given great advice above and I agree completely. Not only is breeding budgies without any experience incredibly dangerous for the budgies' health and well being, but it is never guaranteed that the babies will ever be "people birds", as mentioned above.
Budgies are not "touchy" birds and are not huge fans of being petted. With time, it is possible to gain a very close bond with your pet store budgies (my girl is seven, and she's from a pet store, and after years of care we have a very strong bond) but it will take a lot of patience and hard work.
Best of luck