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Hinata shows up around episode 40 but she is still incredibly shy of talking to Naruto. In episode 33 of Naruto shippuuden she still blushes and loses conscious when she mis-hears Naruto (amusing). In episode 166 (Manga Chapter 437) Hinata confesses to Naruto, but we won't see anything of this develop for a long time as the Manga (which is much farther ahead of the Anime) doesn't touch on the Hinata*Naruto thing as far as I've read (Chapter 500)
She begins to like Naruto in the first episode of Naruto Shippuden. She then begins to care for Naruto more and more as Naruto Shippuden continues.
well, naruto shippuden episode 1 has sai in it, but only because it is a preplay of the future. the first time that naruto actually first meets sai is naruto shippuden episode 33 or 34.
She begins to start liking Naruto more in the first episode of Naruto Shippuden and it just continues to steadily grow after that.
that's episode 51 watch it here http://narutovideoseries.com/naruto-shippuuden-51-reunion/