Tier-1 General dependent visa (child)

Dear Seniors/ experts,

I am Tier-1 general main applicant and am planning to apply for dependent visa (outside UK) for my little girl (single application).

I have following queries:

Do I have to provide supporting documents (tenancy agreement, pay slips, dividends, bank statements..) all in originals. My plan is to scan and e-mail it to my wife in India.

Maintenance fund requirement for dependent visa alone is minimum of 600£ for 90 days? As me and my wife already have valid visa. Am i correct.

Do i need to provide business bank statement as well for corroboration of my earnings.

I am sorry, if i posted my query i wrong space.

Please suggest me your inputs.

Have a good day.

Cheers