Lalajae,
I am so proud of you to go to Japan to study. What an accomplishment as well as adventure.
I lived in Japan since childhood and when I moved back to US, at age 18, I was quite apprehensive even though I spoke perfect English. So I can see how you feel.
Things may have changed now, but you apply for your Alien Registration at the Koto-ku Ward office. There is a section just for foreigners needing alien registration's application and renewal (for those staying longer than one year). When you move residence to another ward from Koto-ku, you have to re-register. So when you move to Oita, you have to do that again.
As for clothing, are you very tall and large? If not, it's easy to find clothes in Japan of your size. Fashion may be different so you can take only the essentials. Food may be something you are tempted to bring but you have to declare and even show all your food at the customs so sometimes they can confiscate things which Japan thinks undesirable.
If you read Hiragana and Katagana, and read alphabet, it's easy to get around in Japan because signs are often in Roman letters almost everywhere. Even there are no alphabet, there is a hiragana under the kanji so that elementary students can read. This is especially true with place names.
Once you enroll in your school, you can obtain a student rate monthly pass for trains between your home and your school and this commute will be greatly discounted. You will need papers certifying that you are enrolled in that school. As for travels outside of the route, you may have to buy individual tickets or buy one of those chipped cards like Suica card.
Just like your mobile phones and bank accounts, once you get your alien registration card, you can get your internet service either from the same mobile company or any other company around your neighborhood or phone companies.
Rice cookers are available everywhere even in the little local electronic store.. and even at a grocery store nearby.
Koto-ku is pronounce with a long first ooooo and slightly shorter second ooo. So it's Kooootooku. It is one of the 23 wards of Tokyo. It is eastern part of Tokyo on the waterfront with very easy access to everywhere. If you want to know more in details visit their website at
http://www.city.koto.lg.jp/language/lang-eng/index.htmlFeel free to ask more questions. Ifll be watching this forum thread.
Congratulation.
Chad