If you're looking for info on ET's, you probably came to one of the best places on the net (my opinion, at least.)
The different species of ET's is arguable. The "general" consensus is that there are three "confirmed" races: Greys, Nordics, and Reptilians.
However, Nordics and Reptilians are also more among the fringe of the field. They aren't reported nearly as much as greys, and the sources are
generally weaker as well. Most believers will accept greys at the very least. There's plenty of information here on ATS regarding the different
purported species, you might want to use the forum search or browse the actual ATS site. I'm sure that there's many, many more species out there;
as mengaurd point out the universe is pretty much infinitely large. There's no telling how many different species exist (and there's no public,
widespread proof that any exist period.) These three are probably the most common you'll find mentioned here at ATS.
Information about Greys can be found here:
Information about Nordics can be found here:
For information on Reptilians, look for information on the Lacerta Files. The first link I found (in the ATS Boards) is
which is from this thread:
Lacerta has been widely disputed, even here on ATS, and a lot of people dismiss it. I'll leave your opinion of it's validity up to you.
As far as pictures go, there's quite a few, and even a supposed interview with a Grey. However, their validity is almost always more questionable
than the theories on the particular species. To my knowledge, there's no pictures of reported Nordics or Reptilians, and if you (or anyone) happen
to stumble across any I'd appreciate a link. You should go through a few pages of the UFO thread here and look for the pictures of greys, or, again,
use the search feature.
Good luck in your searches, and it's great to have you aboard