We've done everything but facilitation (illegal in our state). The easiest, most knowledgable has been through an adoption attorney in Illinois with the firm of "Crouse, Cobb and Bays. They have offices in several places in Illinois.
They also have a website with good info on it.
http://walden.mvp.net/~complaw/lawfirm.htm
They know their stuff and have an excellent reputation. They place caucasian, AA and bi-racial babies....and they place many of them. Their ethics with birthfamilies and adoptive parents are excellent.
They network with other Quad A attorneys and licensed agencies.
Linny