I'm hearing and I'm adopting a hearing child, so I'm not sure if my advice will be useful.. but I know that if you adopt through the state fostercare program that they cannot discriminate against you purely on the basis of your deafness. (They can't discriminate on the basis of race or religion either, but... they do anyway.)
Even though it's illegal to discriminate, I still think you may face significant challenges, particularly if you get an ignornant or mean-spirited case worker. I'm betting that they'd be delighted to place deaf children in your care but if you got a hearing child they'd try to remove that kiddo even if you were strongly bonded and the kid was thriving.
I'm betting that they would want to use an interpreter during the home study and for any meetings and court dates. (The home study is different than just the visits to the home - a home study is the name for the entire evaluation they do on you, your relationship, your home, your finances, all that.)
But that's all just the fostercare system. THere are other ways to adopt. You can adopt through a private agency or do an international adoption. I say try to find local resources - see if you can track down someone who is deaf and has adopted who lives near you and who can help you navigate the adoption process.
