WhatsApp for Business for Non-Profit

Hi all -- I have been asked by a US based non-profit group that works with immigrants to create a WhatsApp based communications channel to reach out to the local community. Given that clients speak different languages, the non-profit want to use Whatsapp for Business with 5 users, so different admins can respond to queries regarding common questions.

1. Is this a correct use case for "Whatsapp for Business" where 5 admins can install the app on their phones and respond to queries?
2. What is the cheapest/best way to get a phone number for use with WhatsApp? Google voice does not seem to have free phone numbers. Is there another alternative for free/cheap?
3. Does anyone have any experience using WhatsApp for Business with multiple admins? How is it working out for you?

Deeply appreciate any help.