K. - First, congratulations on your new little one!
I'm sure that this is upsetting and so unexpected for you and your family. And made harder by the holidays, recovering from childbirth and having to parent your other child as well. I'm a mom of a child with a different special need, but in the beginning I think that we all have similar feelings and apprehensions. And it's normal to grieve for a little while and to need time to wrap your head around it. It's an adjustment, but I promise that everything will get worked out.
I would contact Columbus Speech and Hearing. Check out their website at www.columbusspeechandhearing.com. I'm sure that a call to them can guide you with respect to services. They were helpful when I first looked for places to get my son tested. (Hearing issues were eliminated for him, but it was a starting point.) I would imagine that they would try and get your family involved in learning ASL or using other communication methods as soon as possible so that you can best teach and communicate with your little guy as he grows. I'm sure that they can help you with connecting with other parents and families, too. Usually Yahoo has Groups that you can connect with online. Try meetup.com as well.
Help Me Grow is another agency that you should contact and would be responsible for your child until they are three (at which time your school system will be responsible for a free & appropriate education as well as transfer to the social services agencies that can offer assistance )and can help you get set-up with any county services that you are eligible for so that any impact on your family finances is minimized.
You've probably already checked them out, but I'm sure that there are several non-profit organizations that deal with hearing impairment issues and would probably be good resources for toys, equipment, etc. I would also look into some classes that would benefit him as other senses may be sharper. Maybe baby massage, baby gyms, etc. Perhaps your pediatrician can recommend if and when occupational therapy might be needed.
Finally, take out your health insurance policy and read about the services that are covered with respect to hearing impairment treatments and equipment. Another thing to consider is whether or not he will be hard to insure as an adult. If so, you may want to see if he qualifies for a child's insurance policy that will grow with him into adulthood.
Anyway, I hope that helps. I have no doubt that you'll get better advice from other moms on this forum who have been down your road and have some more practical help to offer. All the best to you and your family and Happy Holidays!