Everyone is doing great! We'll take your lessons again someday, somewhere!
Everyone is fine! We'll take your classes again someday, somewhere!
「みんな」→「Everyone」
「元気にしてる」→「To be doing great, To be fine」
「いつか」→「Someday」
「どこか」→「Somewhere」
「授業」→「Lessons, class」
まとめて言いますと、
「Everyone is doing great! We'll take your lessons again someday, somewhere!」
「Everyone is fine! We'll take your classes again someday, somewhere!」
と表現します。
Everyone is doing well! We hope to take your class again someday!
Everyone is good! We are waiting to take your class again someday!
みんな - everyone
みんな元気です - Every is doing well, everyone is good
またいつか - someday, again someday, one day
授業受けます - take class, take your class
Everyone is doing well! We hope to take your class again someday!
Everyone is good! WE are waiting to take your class again someday!
シンガポール 
イギリス 
