Hi andib479, I have the exact same telescope. If you cover the front of the telescope with a piece of white paper, remove the eyepiece and look down the hole where the eyepiece fits, can you see an image of your own eye?
Also, as someone else suggested, its easier to try out your telescope during the day using your 20mm erecting eyepiece.
BTW, just looking through the eyepieces, you wont get a focussed view of the moon. What you could do is place the eyepiece close to a wall in daytime and you should be able to get a projection of your window on the wall.