Just got laid off, what should I do first?

They called a meeting on Tuesday and 15 of us were let go. I had been there 15 years. I have read a lot of threads here and could not find my exact situation. I have a box of my things and a short letter about benefits. Is there a checklist I should follow?

Thanks for writing this out. I went through something close to it 7 months ago, and it got easier once I kept a simple log of every call and form.