There are support groups for families of folks like your son. Check for a NAMI chapter in your area, (National Alliance on Mental Illness). They are there for you. It is good to talk to others who have walked this path. As others have said, learn as much as you can about this illness, knowledge is power! Encourage your son to learn, also. Help him to do the things that help us stay stable–sleep, exercise, maintaining his medication regimen. See if he'll keep a mood chart. You may want to keep one for him too. It will help you see any patterns in his condition.

Above every thing else, just love him. Sometimes it won't be easy, just be there. I hope things go well. I know you'll learn to handle this.