A traditional seder plate and ceremonial items will also be needed. The zeroah is a lamb shankbone representing, the lamb sacrifice, if no lamb shankbone is available, a turkey or chicken bone that has been roasted by fire may be substituted. The baytzah is a roasted, hardboiled egg representing the burnt offerings of the Temple period. A matzah tash and ceremonial washing bowl of water are also essential items. If the leader feels comfortable, it is possible to use a traditional haggadah available through any Jewish bookstore.
Many believers prefer to use a messianic Jewish haggadah.
These contain most of the traditional readings, but are also accompanied by relevant New Covenant passages and explanations. One resource I recommend to messianic believers is The Messianic Passover Haggadah by Lederer Messianic Ministries. It is a quality messianic haggadah. Lederer also has a very helpful preparation guide for the seder meal. Pesach officially arrives as the sun sets on the 15th of Nisan.