Passover is a very special Jewish holiday about slavery , redemption and freedom. Jews all over the word celebrate Passover to varying degrees of observance. Here are some tips on how to celebrate it.

[edit] Steps

Study the origin of Passover: Read the book of Exodus (or Shemot, in Hebrew). Go to the library and find some other books about Passover. Speak with some Jewish friends to explain some of it to you. Visit a synagogue and speak with a Rabbi. Watch The Ten Commandments again.
Remove all food that had been used prior to Passover. Only foods that were prepared especially for Passover can be eaten.
Attend two seders (one on each of the first two nights).
Eat chametz-free for the eight days of Passover.

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[edit] Tips

Judaism is a vast culture and a religion of various sects. Different authorities may give you different information. Be prepared to sort through conflicting ideas.
Learning some Hebrew can enhance your appriciation of Passover. The part of the Bible about the Exodus was originally written in Hebrew, many people conduct their seders partly or entirely in Hebrew.
Think about the themes of slavery, redemption and freedom. Passover represents a pact between G-d and the people of Israel. The Israelites were slaves in Egypt, and G-d redeemed them and brought them to freedom.
Try watching some movies based on the Bible. "The Ten Commandments" and "The Prince of Egypt" are some examples.
"Pesach" is the Hebrew word for Passover. It's also the origin of the English word "pascal."

[edit] Warnings

Not all matzah sold in grocery stores is fit for Passover use. The rules of kashrut (keeping kosher) are stricter on Passover than during the rest of the year, so even if a food is kosher that doesn't mean it's okay for Passover. Look closely at the box.
If the matzah is flavored, or if it doesn't say KP or (U)P on it, then it is just meant to be a snack and is not Passover matzah. (The "P" means it's for Passover. The box might also say "Kosher for Passover" on it.)