Firstly, "내일 학교에 갈 거예요" is the correct sentence. Secondly, 에요 is actually supposed to be written as 이에요. Both of these are semi-polite versions of, 이다. 이다 means "I am, they are, it is, etc." The difference between the two are when you're supposed to use them. 이에요 is supposed to follow something ending in a consonant. Like in the sentence, "저는(I) 미국(american) 사람(person)이에요(am). 사람 ends with a ㅁ, which is a consonant. That's why it uses 이에요. 예요 follows after words that end in a vowel, like in the sentence, "저는(I) 여자(woman)예요(am)." 여자 ends with ㅏ, which is a vowel. That is why it uses 예요. :]

한국 음악

저는 이 노래를 너무 좋아해요.
오늘 많이 듣었어요. (Once the listener/reader knows what you're talking about, you don't have to reference it/them again until the subject changes or you want to emphasis it more.) :]

http://mp3.zing.vn/bai-hat/BIGBANG-Loser-BIGBANG/IWAFF0WU.html

Jeongmin is right. There are some English words and phrases that don't translate the same way into Korean. "Please" is a really good example of this. ~주세요 (please give me~) and ~해주세요(please do~ for me) are the normal ones I think you'll hear and will need to use in the beginning.

From how it was explained to me, Koreans view the English language as kind of...selfish. Not in a bad way, but we talk about things in our own view instead of everyone else. So to answer your question, unless you're talking about your own body, use 우리. :]