Laid off this week, where do I start? after 6 years as a warehouse supervisor

They called a meeting on Tuesday and 6 of us were let go. I had been there 6 years. I am in Madison, in case local advice matters. I have a box of my things and a short letter about benefits. Which steps were urgent?

Thanks for writing this out. I went through something close to it last year, and it settled down once I kept a simple log of every call and form.