1. This isn't a sentence, but, as a phrase, it's well understood in spoken English, i.e. "I need to know more info/information about...." 2. In American English, your sentence does not really work. We use "box office" to refer to movie sales. So a typical sentence is "This film is number one at the box office." 3. correct 3 (4.) You can use "face" or deal with" ("confront" is another good word). "Narrow-minded" or "old-fashioned" would be the correct adjectives. A sentence might be: "I have to face my very old-fashioned father." You can also say "tackle," but, unless the context is clear, it sounds a little like you are playing American football with your dad. More common is to "tackle a problem." So a sentence could be, "I have to tackle the problem of confronting my very narrow-minded father."

Know more info about - This is ok as slang, clearly the correct word is information. The second and third sentences sound ok but the third is not correct. The term old mind is not a term which is used at all. The term narrow minded is used frequently as long as you are using it in the correct context.