the system for registering phone simcard

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Java

i would like to develop "phone simcard registration system" discription
of my system, before the person uses simcard, they should register it.
for registering system one should provide id and passport number. if
person is under age, one should bring along parents discription.
work flow of the system.
the system should check if provided discription already exist in the
database. if it does exist, it should not register such person. if does
not exist it should store that information in the database.

what else shoud i consider? how can i developt this system. i am equipt
with c++,java, and mysql.