Figure out how keypads work, it'll be a 4x3 matrix so I'm guessing you'll be looking at 7 inputs for the keypad unless you use some sort of IC between your microprocessor and the pad, google for "keypad matrix 8086" or something
You'll have two 7 segment LEDs for digits, figure out if you have common anode or cathode components and figure out which wires control which LED in the display (very easy if you have a diode tester, otherwise simply use a battery and a resistor in series), hook these up to your output pins
Looks like you have four buttons as well, start, pause, stop, reset...if you don't know how to wire up a button, you're in trouble...