Local hospital. You usually can find out about the types of birthing, nursing, childcare or sibling classes available in your community through your local hospital or doctor's office. Don't forget to consider possible online offerings if it is difficult to identify these resources near your home.
Hospital/Doc website. Most hospitals have a prenatal education program. You should be able to find this on the website of the hospital where you plan to deliver. If you can't find it there ask your doctor for guidance.