when you create the face it depends on which way the camera is looking when you click on the vertices, remember if the face is looking away (clockwise around vertices IIRC) from the camera its the other then if the face was looking at it (anticlockwise).
You will know if you have the wrong way because if your face is on the side that shouldnt be facing the camera if its shown its the wrong way and should be removed and done in the other way round.
You will know if you have the wrong way because if your face is on the side that shouldnt be facing the camera if its shown its the wrong way and should be removed and done in the other way round.