Make sure you are signed up for WIC, EBT, and even cash assistance (also, if you apply for cash assistance they WILL go after your child's father for support as well) until you can get back to work. WIC and/or the state health insurance in your area will provide you with a free car seat. You should be able to get a free stroller, clothes, toys, high chair, and blankets on craigslist or freecycle. Do NOT take used bottles, bedding, hats, pacifiers, or cloth diapers for your baby (these things plus a car seat is all you really can't use if it is used as it could compromise the health of your baby).
See if your friends could possibly throw a shower for you. After you have your baby, (at least in my area) the hospital does provide you with some blankets, bottles of formula, and packages of pampers (you can just take them).
I have blankets, socks, shoes, and bottles from my daughter (they are white and yellow) that I could pass on to you if you need them. Make sure you check in with the local churches as well
My littlest little one (and first/ only boy) will be one next week, and I still don't know! It's a serious challenge. The Children's Place is pretty good for basics, but don't buy more formal clothes there- they only look good until you wash them, and then they need ironed. But as far as essential items (shorts, pants, polos, tees without dinosaur, puppy and fireman logos all over them) they're fairly good. The Gap is decent. Most places I've found- and the places I easily buy clothing for all my daughters- are hit or miss at best. TJ Maxx can be a good place to look, but...same deal. Hit or miss with the boy clothes. I hope you get some good answers, because it's always frustrating for me to shop for my son!