Arduino programmer - Timer

I need someone to design a solution using Arduino The needed solution is basically a timer with a display for a camera the display screen says : press button ----> the user press on a button the display screen says : 5 sec the display screen says : 4 sec the display screen says : 3 sec the display screen says : 2 sec the display screen says : 1 sec the display screen says : SMILE the display screen says : WAIT (for a certain amount of time defined in the programme) and loop after the SMILE message 2 options : or the camera is connected directly to the Arduino using a jack (example canon DSLR) and the arduino as to send the order to the camera (just contact) or the camera as no external remote plug and the release command (F8 key stroke) as to be send to the appropriate programme in windows (remote control program) using the usb cable this is really extremely simple software What i whant is the you specified the correct arduino needed the simplest Display solution Write the correct programme and write for a the how to Manuel to do it by my own my technical english is not perfect my french is perfect !