Nefesh B’Nefesh’s website is a great place to start if you are coming from the U.S. or England. They have lots of information about different communities, and lots of other topics. They also sponsor “Aliyah fairs” in different locations throughout the U.S. where you can get a lot of information in one place.
Once you are seriously considering the move, and have narrowed it down to a few areas, a pilot trip can also be very helpful.
Talking to people you know, who know you, who have “been there, done that” is also a great resource.
Good Luck!!