Just got laid off, what should I do first? - any advice?

I was let go as a software tester this week and I am still in shock. Any experience at all would help. I have a box of my things and a short letter about benefits. Which steps were urgent?

Ask for your final pay, unused leave and any documents in writing before you leave, if you still can.

I made a short list: benefits, bills, documents, and then my résumé. One thing each day kept me steady.