Prefer using your personal email instead of your employee email if you are an employee. You are creating a personal account owned by you here, and this account is then given access to organisation.
Minimum requirement is 8 characters
This must be your real name. Using fake names in prohibited. This is NOT a publicly shown field, so no need to worry
This doesn't need to be your full real name, but it should be something that's still clearly you, like firstname, shortname or commonly used nickname