Lighting the menorah and saying the blessings
Adding the appropriate prayers to the regular daily services
And the customs (not obligatory):
Fried foods such as potato pancakes
Playing with the dreidel
There are many Hanukkah songs, but any music is appropriate for Hanukkah.
No.
Yes. Hanukkah does not add any food rules.
There are no special cookies associated with Hanukkah. Any kind of cookies can be seen at Hanukkah parties.
The concept of decorating for Hanukkah is relatively new (only a few decades), and there are no customs or rules about it. Most families do not do any decorating for Hanukkah.
There are no particular clothing requirements for Hanukkah in Jewish law. Whatever is acceptable for the rest of the year is good for Hanukkah too. Hanukkah is not one of the major Jewish festivals.
The last day has a special name (Zos Hanukkah), but otherwise is no different than any other day of Hanukkah.
There's really no such thing as "Hanukkah Dinner". Meals during Hanukkah have no special times associated with them. Jelly donuts or potato pancakes are traditional and may be served at any time during Hanukkah.
You mean like Santa Claus? No. That is not a Jewish kind of attitude or belief. See also:More about Hanukkah
Hanukkah is a holiday, while "kosher" is an adjective referring to food which is made in accordance with the Torah-rules for preparing food. Celebrating a "kosher" Hanukkah, it would mean that any foods served during the holiday were kosher.
No but their are rules when your their
Special foods include potato pancakes (latkes) and jelly donuts (sufganiyot). Also, any foods fried in oil are traditional. There are no special drinks. There isn't anything that could be called a "Hanukkah Dinner" though.