Looking back at my own young marriage and first having a baby, I didn’t take advantage of offers of babysitting. My husband and I could have used more fun without my son around, but we felt strange about leaving him. If you have folks you trust, take advantage of offers to give yourself time with your husband and/or friends once in a while.
Also, network with other young (or old) moms who can relate to having baby blues, being surrounded by dirty diapers all day, and being isolated if you don’t work. I had postpartum depression after my firstborn and I thought I was weird or something to feel the way I felt, so I kept it inside. I think the parenting classes mentioned are a great idea, not only for obvious reasons, but you may make a new friend in the process. When in doubt about something that affects your baby, don’t hesitate to ask a pediatrician or someone with experience for advice and/or help. You’ll do great!