No worries, we can go as slow as you wish. And you do not need to pay extra for a phone call as we can answer it here. Here is what you will want to do:
First, you need to notify the SSA that he has passed. Bring with you 1) your photo ID, 2) your birth certificate 3) your marriage certificate and 4) his death certificate
If your husband's benefit is greater than your own you will want to apply for a survivor benefit to replace your own.
You will also tell the SSA you wish to apply for the $255 death benefit.
You can't do these things online, unfortunately, so you need to go in person, typically. It may be possible to do it on the phone, but the SSA is hard to reach by phone and you will still have to mail your documents, which is risky (unless you have a trusted loved one to deliver them, get them acknowledged as received, and immediately returned to his hands to return to you).
Note that if he died in Dec., the check he received in Dec was owed and and good to go (as it was for Nov). But a check received in January if you don't get him cancelled soon will not be due him and must be returned, so don't spend it.