Think about whether you can handle a child who has contact with their birth family. For some children who have siblings or other relatives, some continued contact is very important. The type the children they serve, and the families they need. The counties and geographical areas they serve. Ask when you can expect your home study to begin.
Most agencies prioritize home studies based on the available children waiting for families.
Thus a family wanting a healthy, young child will usually wait much longer than a family wanting an older child or siblings. However, the opposite may be true if you are willing for the child to have frequent visits with the birth parents, and are able to help the child reunify with his or her parents if that's possible.