Layoff happened 4 days ago, feeling lost (Richmond)

I lost my job as a data-entry clerk and I am not sure what to do first. 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. 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.