Are you asking about care agency that recruits and employs care workers who assist elderly or disabled people in their own homes, helping them to remain independent?
If so, it would help to know where you live.
If you live in the U.S., you might find information on the following site to be helpful:
:: National Association for Home Care and Hospice ::
If you live in the U.K., there is some information on the following site that may be of help to you.
Starting up a domiciliary care agency?
A quote from that site:
"Care agencies are statutorily governed by the Commission for Social Care Inspection (CSCI) in England, the Care and Social Services Inspectorate Wales (CSSIW) and the Scottish Commission for the Regulation of Care (SCRC). In Northern Ireland, agencies are governed by local Health and Social Services Trusts. Agencies must be fully registered and inspected prior to offering an at-home care service."