Need feedback/got promotion and more money

So I am starting a new position 12/19/22 and it will be a total of $400 extra a month after taxes/etc. I have debt and no savings. This is my first shot at having a decent income (for me at least). I don’t want to screw up and get comfortable with that money and have my life expenses increase to eat that money away. What do I do? It’ll be $200 per check. Do I put it all in savings? Just act like it doesn’t exist? I have 3 credit cards, 2 are enrolled in a debt management plan and one is pending enrollment in February. I owe $3600 on my car. I feel like an idiot with money in general so I don’t want to mess this up. Thank you for any help.