Adoption is a wonderful way to add children to families. It isn't so simple anymore. It seems even more poignant in pain if the parents have faced infertility. It is a big responsibility to place a child in a really good home. Hire a social worker you can trust.
Most home studies start with questionnaires to fill out.
They will want to know about your life history, childhood through present, including the marriage relationship. They ask about your goals in life. A social worker then makes an appointment for a home visit. This is probably the most notorious of the whole process. They are also on the lookout for safety features such as properly covered wall plugs and protection on stairs, etc. in the home.