How to Celebrate Shavuot? 
Like other Jewish holidays, candles are lit at sundown on the eve of the holiday. For example, when Shavuot's first day is on May 29th, candles should be lit as the sun sets on May 28th.

The blessing over the candles is as follows:

Ba-ruch a-tah A-do-nai E-lo-hei-nu Me-lech Ha-O-lam a-sher ki-ddi-sha-nu be-mitz-vo-tav v’tzivanu lehadlik ner shel yom tov.

Blessed are you, God, Our God, Sovereign of the Universe, who has made us holy with commandments and has commanded us to light candles for the holiday.

The she-he-chi-ya-nu blessing, which is commonly said to celebrate reaching life’s milestones, is said at candle lighting and after the holiday wine blessing has been recited:

Ba-ruch a-tah A-do-nai E-lo-hei-nu Me-lech Ha-O-lam she-he-chi-ya-nu ve-ke-yeh-man-u ve-he-gi-anu lah-zman ha-zeh.

Blessed you are, God, Our God, Sovereign of the Universe who has let us live and sustained us and has brought us to this time.

 And,

• At the festive meal recite the holiday kiddush blessing.
• Recite the HaMotzi blessing over the challah (Shabbat and holiday bread).
• Attend a Tikkun Leil Shavuot evening at your synagogue or temple, or stay up late into the night studying the Jewish topic of your choice.
• Eat dairy foods
• Read the Scroll of Ruth (found in any complete Bible).
• Buy flowers for your synagogue and home

For explanations and symbolisms of these observances see Customs Associated with the Shavout Festival

Mazor Guide to Shavuot, Pentecost, brings you much more about the holiday, its meaning and its traditions... See the links below.

• Shavuot Home
• Shavuot Purpose and Meaning
• Shavuot Customs and Traditions
• Shavuot Celebrations and Blessings
• The Story of Ruth and Naomi
• Reading Ruth: Rhyme and Reason.
• Shavuot Hidden Facts and Messages
• Shavuot and the Number Six
• Shavuot Cookbooks

MazorGuide Recommended Reading

RUTH - ArtScroll Edition
A new translation with a commentary anthologized from Talmudic, Midrashic and Rabbinic sources

The ArtScroll Series presents the comments of the classic giants of ancient and contemporary times in a logical, comprehensible manner, like a master teacher on an exciting voyage of intellectual discovery.

• Entire Hebrew text reset in clear modern type
• Flowing English translation
• Commentary anthologized from 2,000 years of Talmudic and Rabbinic sources
• Overviews exploring the hashkafah/philosophical background of each volume.

To Be A Jew: A Guide To Jewish Observance In Contemporary Life (Paperback)
by Hayim H. Donin (Author)