Welcome to the forums! You could probably learn a lot about the American and Japanese release tamagotchis through Mimitchi.com's websites. Just click on the links for the different types of tamagotchi under the "Mystic Fortress" section of the sidebar. I know that I learned quite a bit about 'gotchis from those pages.
Also, as an afterthought, unless you plan on turning this into a log about your tamagotchis' daily activities, this thread is probably in the wrong place.
Edit: Hooray, now everything's taken care of! Thanks, TigerLily.