When you're talking about everything in Japanese, you can select among　すべて（全て）, 全部（ぜんぶ）,みんな. 全て and 全部 can be used for objects or people. みんな can be used for object or people too, but is used for people more. 全て is more of a written language whereas　みんな and　全部 are colloquial. 花（はな）が　〇全て／〇全部／〇みんな　枯(か）れた。 All flowers have withered. 島民（とうみん）は　〇全て／〇全部／〇みんな　避難（ひなん）した。 All of islanders have evacuated. これ　〇全て／〇全部／△みんな　（を）買（か）いたい。 I'd like to buy all of these. 〇みんな／×全て／×全部　で　協力（きょうりょく）しよう。 Let all of us cooperate together! I hope this is helpful!

I'm not a Native speaker but I'm capable to help you. みんな directly translates to "You all" or "You guys", referring to a group of people. Example : みんな、おはよう！Good morning, everyone! ぜんぶ is the proper word to say "everything", just like your example. There is also いろいろ and なにごと but their usage is quite different and depending on the context you are talking about. Hope I helped ><