overwhelmed new mommy

Sarah
My son is 6 days old now and I've had a couple emotional breakdowns lately. I feel that I am second guessing everything I do. I feel so lost in the dark about how to care and provide for my baby. Is he getting enough milk? How do I know he is getting enough milk? How do I soothe him? I'm very afraid of doing the wrong thing and just feel that I have no clue what I'm doing. Feel pressure of being a mom, people always said you'll just know what to do, your its mother. You will know his cries. 
Well I can say right now I am no where even close to that and it's making me an emotional mess. Any advice?