Help: 4x3Keypad Security Safe with 3x-7 segment displays and sound buzzer.

Hi Arduino community, i need help with my school project. I'm clueless about arduino, any help corncerning my project would be appreciated.

The project is based on a keypad security system connected with 3x 7 segment displays.

Conditions: if the safe/door is closed, the three displays must diplay "C l s"
if the door is open, the three displays must display "O P n"

if correct pin code is entered on keypad, the door must open and buzzer must beep once.

if incorrect pin code is entered on keypad, the three displays must display "E r r", and buzzer must beep twice. (short beeps)

Well before we can even being to help you we need to know what you are using! What motor,keypad,display, buzzer, etc! Also, don't expect anybody to do your school project for you, however, we will give you suggestions!