To the best of my knowledge there is no Joystick/Gamepad support for this game.You could try going into options from the game screen,selecting shoot and move and then try clicking on an action and when requested press a button on your Joystick/Gamepad and see if it accepts the action.
To be honest the game is best played with the keyboard and mouse,I know this takes some doing to begin with but it really is worth the effort once you get used to it.
I have found that the best settings are-
Forward - up arrow
Back - down arrow
Strafe left -left arrow
Strafe right -right arrow
Jump ins(numpad 0)
Crouch right control
Prone - end
Primary fire - left mouse
Look down the sight - right mouse
Give these a try and post back if you have problems.