Need HELP Identifying these Barbies...

I have recently acquired a Barbie collection and am trying to identify 3 of the Barbies that seem to be more unique. I do not have much information on any of the three.
Red Head
Signed behind neck: 1966 Mattel Inc. China
Do you know her name? It does look like someone cut her hair in back, but I am not sure. Her clothing is dirty in spots, but maybe would look great if cleaned! I think that it is original to her because it seems to be sewn on her. Do you know if the clothing is original to her? It all seems to fit together fashionably. Her face, make up, etc looks beautiful! She still has her bracelets, purse (although it is loose), headband and her shoes. Do you know her value?
Blond
Signed on lower back: Mattel Inc. 1966 Malaysia
Do you know her name? She is beautiful! Her hair is still in place, her makeup is bright and clear. Her dress is beautiful as well. It does have snaps in the back so that you can undress her. Do you know if the clothing is original to her? She still has her necklace and her shoes. Do you know her value?
Black hair
Signed behind neck: 1991 Mattel Inc.
I believe her to be Liza Minnelli. Do you know if this is correct? She is a Show Stopper! Exquisite Sequin Gown... She does not have any shoes, but I'm not sure if she was supposed to have them she has fancy ankles, do you know? Do you know her value?

Along with these dolls was a box for the 2002 National Barbie Doll Collectors Convention which had a replica of the Saturday night banquet centerpiece doll with a special hair color and fabric. Do you know how I could get a picture of this doll to see if I have the doll in this collection?
I played with Barbies, but I am not a collector of them, so any information would be greatly appreciated.