Watch 01-20 of the TV series, and the Director's Cut of 21-24. Then watch The End of Evangelion. Skip Episodes 25-26 and Death and Rebirth. 25 and 26 are shit which were supposedly made because of budget cuts (The End of Evangelion is the same story from a different perspective). Death and Rebirth is a recap movie that was made to catch people up before The End of Evangelion. All of the new scenes it has are in the Director's Cut episodes.
So, to recap, TV series 01-20, Director's Cut 21-24, The End of Evangelion. Then, read the manga. And the awesome doujinshi RE-TAKE of Evangelion. And then the remake movie "Rebuild of Evangelion 1.0 You Are (Not) Alone."
By then, you too will be jizzing on Rei figures.