Episode 208
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Because people are working only on the Naruto Shippuden english subbed ones right now. No one knows when they will start the dubbing again.
Episode 115, Shippuden right after the intro
Naruto meets Sai right after returning from his mission to save Gaara. In the manga that would be book 32.
naruto hasn't fought sasuke yet but there are only 142 episodes right now so my answer might change.
By "fake gaara" i think you might be thinking of the flower defence? if this is right it should be episode 186 of naruto shippuden, hope this helped