Q: Are there different prayers on Pesach than on ordinary days?
A: For the first two days of Passover, the amidah (standing) services are in the "Shalosh Regalim" section (after Hallel and Mussaf for Rosh Chodesh) in most siddurim. You start out with the everyday morning brachot, then psukei d'zimra and Shma for Shabbat and Yom Tov, then shacharit for Shalosh Regalim with the Pesach additions, then the full Hallel (the first day), then Mussaf for Shalosh Regalim. Mincha and Maariv are the same amidah as Shacharit. For Chol HaMo'ed you say the regular services, but add "ya'aleh v'yavo" in the amidah (during "retze", before "modim"), and after Shacharit you say the abridged Hallel and again Mussaf for Shalosh Regalim. The last two days are Yom Tov again, so same as the first paragraph, but Hallel is abridged. Hope that helps. :)