You can print out a seder service for passover, or simply read what passover means to us as Christians.
It is not Biblical for Christians to observe Passover.
Passover was an OT memorial meal which
Jesus replaced with the Lord's Supper as the NT memorial meal (1Co 11:24-26).
In the NT, we are to proclaim the Lord's death until he comes (1Co 11:26), not Israel's deliverance.
NT believers are not to use Jewish ceremonies.
Paul says that practicing these ceremonies is turning back to dead, miserable, worldly forms of religion, because they do not come from the
new creation in Jesus Christ (Gal 4:3, 8-11; Col 2:8, 17, 20; Heb 10:1).
NT believers are not to use any ceremonies not authorized by Jesus Christ or the apostles.
Paul states that unauthorized ceremonies are "will-worship" (Col 2:22-23, KJV), devising our
own way of honoring God instead of honoring him
only in the way he has prescribed.
All forms of religion outside the NT are worldly because they are authorized by man only,
and not by God.
We should do nothing that dishonors God (1Co 10:31).
Remember Uzzah's mistake of presuming God would be pleased with what seemed good
to him (2Sa 6:6-7).
Remember Nadab's and Abihu's mistake of presuming God would be pleased with what seemed good
to them (Lev 10:1-2).
And David, who had no warrant from God to build a temple, was stopped by God
because he had no warrrant for doing so (2 Sa 7:13).
We must inquire of God in his word how
he would have us honor him (1Chr 15:13).
God in his word authorizes no other NT rites or rituals but baptism, the Lord's Supper, anointing with oil (Mk 6:13; Jas 5:14) and laying on of hands (Ac 6:6, 8:18, 13:3; 1Ti 4:14; 2Ti 1:6; Heb 6:2).
It is not for us to improve on God's ordinances.
For the precepts of the ceremonial law were abolished (Eph 2:15; Heb 9:10) and set aside (Heb 7:18-19) when the covenant was made obsolete (Heb 8:6-10, 13, 9:15, 10:9) for which they were the condition (Ex 19:5; Jer 11:4-5, 7:23; Lev 26:3 w/12: Hos 1:8-9).
In the NT ii is
disobedience to practice them.
So it is one thing to
learn about the Jewish Seder, just as we learn about the other Jewish ceremonial laws,
but it is quite another thing (disobedience) to
practice the Seder in the NT,
just as it would be to practice the cleansing rituals for the defilement of sin.
Therefore, Seder
practice (not Seder instruction) is unauthorized, disobedient (Gal 4:9-11), dishonoring, non-Christian will-worship.
It is human wisdom, not God's wisdom;
it is zeal (though well-intentioned like Uzzah, Nadab, Abihu and David) without knowledge (Ro 10:2).