What kind Barbie dolls are these? Pictures included!?

Question

If you could tell me the year, model, or whatever you know about the following Barbie dolls, I would appreciate it.

i just need to do research about them so I know what I am selling.

Ken I think?-- http://i25.tinypic.com/2hi4j6x.jpg

Barbie?-- http://i29.tinypic.com/2v85091.jpg

Younger-looking Girl-- http://i26.tinypic.com/1z4d9vp.jpg

And this last Barbie doll is larger in size and has a stand for it (1976 printed on stand)--

http://i32.tinypic.com/51nas.jpg

All i need to know is there model or what series they are!

Answer 1

last one is Skipper Barbie's little sister

Answer 2

next time if you use pictures at least give them clothes!