I am going back to a private sector…

I am so done with this constant pressure and stress. A week ago I ended up in a ER. I’m a probi (8 months on a job) and waiting to be laid off any moment. I can’t afford to loose an income, I have kids and bills to pay. So I reached out to my ex supervisor and got my job back. Now… I ll be reaching out to my supervisor on Monday, telling him I quit. Should I even give them 2 weeks notice or just quit? Also, what should I do before I ll leave? Never been leaving federal job so I have no idea of there are certain things I need to do?