How do you say "I"m going with (insert name of friend)"?
If someone asks me, where are you going today, and I say 학교 가요. And then they ask me, with who? And suppose I wanna say, with my boyfriend Kim Woo Bin. Would I say 제 남자친구김우빈 하고같이 가요.?

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제 남자친구김우빈 하고같이 가요 is correct, except that the proper way to write it is 제 남자 친구 김우빈하고 같이 가요

You can also shorten it to (제) 남자 친구 김우빈하고 가요.  (PERSON)~하고 가요 is understood to be ~하고 같이/함께 가요.