Adding a Family member

I am new to bitwarden sign up for the family plan. It will be my wife and I only on the plan. I have a couple of questions.

  1. I only need on Vault? Yes or No
  2. If yes for the first question I will just have to send her an invite to share with her? Yes or No
    2A She would have to create a account? " Correct" Will this be her own vault.
  3. We only need Collections
    Basically we need to share bank accounts login and other important information. For my own stuff she I do need to share with her and her stuff she dose not to share with me.

One last question when I send her invite to do what I want to do I for user type I should set as Manager? Yes or NO