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This example will continue to loop until you press a key.  This is because if your program passes over a Getkey and no keys are being pressed, it assigns 0 to the variable that is stored from the Getkey (In my example that was K).  If you would like to detect a certain key, just change my 0 to something else.  The way the values work is first the row # and then the column #.  For example, Enter would be 105 because its in the 10th row and the 5th column or Y= would be 11 because its in the 1st row and the 1st column.

As programming is always a learning experience, I think its better for me to not give you the exact code that you need, but rather you try to use this information to develop your own code.  If you have any further questions, don't hesitate to ask.  My suggestion for trying to learn how to detect input, would be to first just make a dummy program that checks for two different keys being pressed, and then have it say something like "You pressed left" or "You pressed right".  Then try to implement what you learned into what you need for your game.