Loss of all passwords and bookmarks

I recently bough a new computer and transferred all my data, passwords and bookmarks to it. Each time I opened my mozilla browser I was encouraged to create a profile , but each time I just continued without creating a profile. Finally today I was not given an option to proceed without creating a profile so I did. But now all my passwords and bookmarks have disappeared. When I try to find them I am advised to load my previous profile but this is not an option the only profile I have is the one I just created with the missing data. Can you please tell me where the appropiate files are stored and how can I recover them. Thanks