It's a scam. Don't give him your address or any other information. The check will bounce and you'll be liable for the funds. If he contacts you again, tell him cash only. He'll disappear.
I just received a reply to my Craig's list ad. He said he wanted my item and would send a bank certified check, and make arrangements to pick it up, also will give me an extra 50 for holding the item. Sounds suspicious.
It's a scam. Don't give him your address or any other information. The check will bounce and you'll be liable for the funds. If he contacts you again, tell him cash only. He'll disappear.