Adoption. 👶🏽👧🏽

Kylie • Pregnant with a baby girl after 8 years TTC. 💕
My fiancé and I are currently trying for one of our own but, he has mentioned adoption A LOT in the past couple months. My brother was adopted straight out of the hospital by my parents and I think it's a great thing so, I'm all for it. We plan on getting married any day now (pretty park wedding. Just the two of us. His best friend ordained to marry us).  
Anyways, has anybody here ever adopted a new born?  What were the costs if you don't mind me asking? (I know it's crazy expensive).  How long did it take to get the child? Do you get to find out anything about the child beforehand such as family health history and such?  Any input would be greatly appreciated!