(Counting of the omer): An omer is a biblical measurement of grain. The counting of the omer is 49-day period that begins on the second night of Passover during which each day is counted with a blessing. On the 50th day, the Festival of Shavuot is observed.
At the beginning of the Passover seder, the youngest person asks the Four Questions. Here's a handy guide to the questions in English and Hebrew, with a downloadable melody and printable version.
Don't be overwhelmed by hosting your own seder. Use this handy checklist to help you prepare!