Any service that you pay on a monthly basis, call to cancel (ie cable tv, satellite radio) or reduce to a minimum plan (ie cel phone contracts) tomorrow first thing.
Look at what bills are due coming up. What do you not /have/ to pay? CC’s and optional services would be included in that list. You mentioned car insurance. How many cars do you have? If more than one look to your state laws to see what you have to do to properly cancel the insurance on all but one.
Does your church offer assistance for such things? Are there other charities you can tap at this time?