Well I'm not sure if I could help you enough with this.. Anyway, To use 은(eun) or 는(neun) means the word in front of that is subject. For example, "I like you." can be translated into "나는 너를 좋아한다" in Korean. 나(na) means "I" or "Me", 너(neo) means "You" and 좋아한다(jo-a-han-da) means "Like" ~한다(~handa) means it's verb, for example 노래 means "song" but 노래한다 means "sing". But it's kinda literary style. We usually say ~해(hae) instead of ~한다 in spoken language. If you use grammatical makers at the end of all of each words, You don't need to much care about the order of sentence. Well.. It's crude a little, but "너를 나는 좋아한다" also makes sense. But, the problem is many koreans usually omit grammatical makers in spoken language. If you don't want to use grammatical makers, you have to make sentence in right order. Usually subject comes first, object comes to the next, and verb comes to end of sentence. So, 너를 나는 좋아한다 and 나 너 좋아해 mean "I Like you." But, 너 나 좋아해 means "You like me" I might be not able to all of them now, but there are so many grammatical makers in Korean. If you have any other question, just message me feel free.

Ah I read that you know how to speak japanese. Korean and Japanese are much alike in grammer. (As much as I know Japanese seldom omit grammatical makers..Well I'm not sure.)