Yes, you need to show three months of operating expenses in your bank account. Along with your application, you need to submit three months of bank statements that show you have three times your operating expenses.  Licensing expects your expenses will zero out on your estimated budget. That means if you have a monthly income of $20,000.00, you will spend all $20,000.00 to operate your facility. Therefore you would need to show $60,000.00 in the bank.
The amount is calculated using the Monthly Estimated Budget form that is part of the license application.
Regional Center Reimbursement Rates are based on the level of the facility.
Levels refer to facilities, not clients.
If you will be working with mental health clients you will need to see what is the social security income received by the client. Most clients with long-term psychiatric disability receive between $1000.00 and $1100.00 per month.