Everyone, All, Everybody
noun
Everyone (formal name ender). This is just a polite way to say everyone (and you want to be polite to everyone, because everyone > you).
みなさま
The reading for both kanji here are the same as the ones you learned with their kanji. Everyone can breathe easier now.
私が今ここにいるのは、皆様のおかげです。
It is thanks to all of you that I am here now.
皆様、ご起立ください。
Everybody, please stand up.
このプロジェクトを成功させるには、皆様のお力が必要なんです！
We need everyone's help to make this project a success!