I am not into fashion too much. But I like business. So should I take fashion marketing and merchandising?

I don't think you'd really enjoy that class since it will all be based around fashion, in my opinion. If your school offers regular business, marketing, and merchandise classes, I'd take one of those instead. Don't take a class about something you don't enjoy, because those weeks will be heck for you. I know from personal experience. My older brother enjoyed the regular business classes when he took them. I don't understand any of that, so I'm taking Law and Child Psychology, because I enjoy and understand it.