Adoption. He's in South Carolina and I'm in Houston, Tx

Ladies when did you decide that you wanted to adopt? I've been ttc for a year and 4 months and I feel like it's not meant to be. So I'll love to adopt a child that needs a home and a child to love. I was looking though adoption sites and ran across this 8 year old that stole my heart! I'm only 19 and So is 20 he agreed that we can adopt. So is almost 21 and it shows you have to be 21 to adopt. How long was the process of Adoption? How much did you end up paying? What were questions they asked? Did you have to have more than one room so the child gets their own or could they share?