Just got laid off, what should I do first? after 17 years as a mechanic

I lost my job as a mechanic and I am not sure what to do first. I have been trying to stay organised about it. I have a few weeks of savings and a rent payment due. Is there a checklist I should follow?

Thanks for writing this out. I went through something close to it 5 months ago, and it settled down once I kept a simple log of every call and form.