It helps ease your anxiety and fears about reaching out to a community which uses a different language and has different customs if you learn as much as you can about it before you actually meet them. As a deaf person myself, I find nothing more impressive than someone who has taken the time to learn how to sign so they can talk with me instead of expecting me to do all the work trying to hear them with ears that don't work all that well. Head out to a major bookstore or over to an online bookseller and ask for books on deaf people and sign language. No one can do ministry alone. This is a simple enough statement, but I cannot tell you how often I've seen a deaf ministry at a church become the responsibility of one parent of a deaf child, or one sister of a deaf adult, or an interpreter who just wants a place to worship.
Churches form committees for just about everything under the sun.
Put an advertisement in your church bulletin and newsletter to find out who else is interested in learning about deaf people and making your church a welcoming place for deaf people. It is important that you have people who can explain and advocate for deaf people among the congregation. Contact with any unfamiliar culture is bound to make some people nervous and lead to misunderstandings and fear. If you have a committee ready to educate your church, it's less lonely to go out there and be an advocate. This also makes sure that you are partners in ministry not a committee of hearing people trying to speak for deaf people.