Becoming Part 2 is the final episode of season 2. The first episode of season three, "Anne" is what follows.
Buffy the Vampire Slayer - 1997 Becoming Part 2 2-22 is rated/received certificates of: Germany:16 USA:TV-PG
Buffy the Vampire Slayer - 1997 Becoming Part 1 2-21 is rated/received certificates of: Germany:16 USA:TV-PG
Mostly Willow, but the rest of the gang had a part in it too.
Buffy the Vampire Slayer - 1997 Bargaining Part 2 6-2 is rated/received certificates of: Germany:16 USA:TV-PG
Buffy the Vampire Slayer - 1997 Bargaining Part 1 6-1 is rated/received certificates of: Germany:16 USA:TV-PG
Buffy the Vampire Slayer - 1997 Graduation Day Part 1 3-21 is rated/received certificates of: Germany:16 USA:TV-PG
Buffy the Vampire Slayer - 1997 Graduation Day Part 2 3-22 is rated/received certificates of: Germany:16 USA:TV-PG
When Buffy the Vampire Slayer begins in season one, Buffy is sixteen and has already accepted she is the Slayer, which caused her to be expelled from her school in LA and sent to Sunnydale (she burned down a gym full of vampires, but of course the school thought she'd just burned it down for no reason). In the show, the viewer is shown a flashback of Buffy being called in the season two episode Becoming Part 1, among series of flashbacks from Angel's past. The full story however is in the original "Buffy the Vampire Slayer" movie which was a preciser of the show (it involved all different people and different vampire rules but it was still made by Joss Weaden.) She was 15 in the movie.
Buffy the Vampire Slayer - 1997 What's My Line Part 1 2-9 was released on: USA: 17 November 1997 Germany: 20 February 1999
Buffy the Vampire Slayer - 1997 What's My Line Part 2 2-10 was released on: USA: 24 November 1997 Germany: 27 February 1999
Cordelia was basically what the majority of people today would call a witch. Played by Charisma Carpenter, she was a force of good in a horribly evil world. Not only did she have a decent part in Buffy, the Vampire Slayer, but also was a huge player in the spin-off, Angel.
Did you check http://tv.blinkx.com for episodes? This is where I watch all my shows online. Buffy is here: http://tv.blinkx.com/show/buffy-the-vampire-slayer/HaNjVc11h07NIaCe0moFDmpe90ck8hK8jC3Tqg