Photoshop is alot better program than gimp when it comes to making gifs.
I made a quick transparent gif in photoshop to show you what it would be like when you save a gif.
in Photoshop when you want to make a transparent gif you have to make sure that the image you dont want to be show stays hidden. like so. clicky
now usually the bottom layers will stay hidden through out the frames, but for the one I just made I made them visible as the frames went on. clicky2
now when you want save any type of gif you have to go to file> save for web & devices. otherwise the gif wont work. clicky3
when you do get photoshop and you have anymore questions about it you can talk to me anytime. c: I will try to help you as much as possible