Making an Animated GIF with Adobe Photoshop and Imageready

I want to make an animated gif with team logos. I know that I need to put all the images of the animated gif into a photoshop file first with layers, but how do I place my gif images onto the photoshop file? Photoshop only allows you to place AI, EPS, PDF, and PDP files.

the absolute dirty basics are:
1) open your image files
2) ensure they are RGB
3) turn the "Background" into a layer in the layers palette
4) drag and drop each of your image layers onto/into one "central" image
5) position each layer where you want it
6) flip to imageready and animate

like i said, that's the basics, but it should get you started