Replying to Photoshop help!!! trying to make sequence pictures

i have used the search bar
i searched cults and found nothing

i have adobe photoshop CS3
i got the whole suite(not illegaly)

so i open one of the photos and then to open the other ones a create a new layer
i go to open and open the next photo
it replaces the background photo
what am i doing wrong??

i know that you have to auto aline the layers but how do you go about that
and i know after you erase where the other photos are of the people to then create the sequence



help NS???
thanks