Don't be afraid to ask your doctor anything! She knows you're 18 and have never been through this before. How are you supposed to know any of this? Also, who cares what she thinks? It's her JOB to care for you during pregnancy and delivery -- and that includes answering your questions -- and after that you never have to see her again!
1. Will he have to stay in the hospital? If so how long? Yes, the baby will be in the NICU. The earliest babies are usually discharged from the NICU is 34-35 weeks' equivalent, but often it's longer. It all depends on how he does.
2. Will he have any problems learning..seeing..talking..walking? Preemies have a higher incidence of problems than full term babies, but by 32 weeks, he should be okay. In my mind, getting to 32 weeks was the biggest milestone; after that, I really felt like the baby would do fine. Btw, I have a cousin who was born at 27 weeks (and that was 25ish years ago, when the technologies weren't nearly as good as todays'!) and she's perfectly healthy and smart.
3.I'm having the baby shower on Nov 13 should I put his size as preemie or should just put regular? It's up to you. He'll be in preemie sizes for a while, then in newborn and so forth. We got a variety of sizes at our baby shower, which was good, since they grow so quickly in the beginning. I do laundry every couple of days, so honestly I found I don't need that many clothes. Also (unsolicited advice), I didn't register for ANY clothes, but we still were given a ton. If it were me, I would register only for non-clothing items so that hopefully some people will give you those, because I find people give clothes whether you register for them or not.
4.What would I need anything special like a specific car seat stroller because he will be so small? Infant seats start fitting at 5 lbs and he may well be that size before he's released. The NICU staff will surely be able to give you good advice, and you'll have time to buy anything you need before you take him home. I would NOT start with a convertible car seat, though, since those don't fit many full-term newborns well.
5. Is it harder to care for a preemie then a regular baby? Every baby is different! Unless a baby has medical issues, which can make caring for them harder, it just depends on his personality!
6. Do I have to breast feed more with a preemie then with a regular baby? I'm not sure. In the beginning, you will probably have to pump breastmilk and it can be fed to him (generally suck/swallow/breathe isn't coordinated until about 34 weeks). The NICU staff will guide and help you transition to breastfeeding and they will be able to answer any questions you have. Also, please request a visit from the hospital's lactation consultant -- they are the experts about breastfeeding Breastfeeding often isn't easy and doesn't come as naturally as many people expect, but it's such a great gift you can give your son (especially as a preemie!), and the lactation consultants are a huge help in teaching you to get a good latch, making it less painful in the beginning (it isn't comfortable to start out with, but it gets better quickly, I promise!).