If you want an animated gif, follow these steps:
open you PSD file
in Photoshop, go the menu window > animation
this panel helps with the animations, and I suggest you turn it into a frame animation it's easier for a begginer, to do that, in the animation panel, click in the top right icon and chose the "convert to frame animation".
in this animation window, you can add frames and specify the time of each and if it loops, etc.
Note that if a specific layer is visible, that layer will appear in the frame selected, and so on (to make the layers visible just click on the eye icon.
When you're done, (and you can test your animation by clicking in the "play" button, etc), you will save the gif, just go to the file menu > save for web, and here select gif, and on the right column, at the bottom, indicate which type of animation, loop, etc.
Make a few tries and you'll get the hang of it :)