The pilot.
It basically just introduced the characters and they sang Journey.
The first episode the Warblers appeared in was the episode, "Never Been Kissed" which is the sixth episode of Glee's second season.
The episode is called "Sectionals" its the 13 episode of Glee's 1st season. Loakleyxx
The first episode of the season 3 glee is 44 minutes
The first episode of Glee was ran on May 19th 2009.
There is no episode on Glee that is named "You Do". However, there is an episode on Glee that is "I Do". S04E14
Glee episode Laryngitis is in the first season of Glee. Google Glee and it will come up with a website where you can watch full episodes for free if you cannot watch it on DVD.
Season 3, Episode 5
His not currently in glee because his 7 episode arch hasn't started. Apparently his first appearance is going to be in episode 12! :)
Auditions
Pilot
Alfonso Gomez-Rejon directed the Laryngitis episode of Glee. This was his first episode that he has directed. The Laryngitis episode was written by the creator Ryan Murphy.
Season 3 Episode five 'First Time'