Congratulations! Here is are some random thoughts for you.
I had a bigger age gap to deal with so I finally tried a sling. It's awesome! I wish I had it with my first. They are not all ugly since there are pretty slings. My intent had been to keep us mobile at the playground, stores, events, etc. Not only is baby with us and big kid doesn't feel too pushed aside by a stroller, but my son loves being close to me. (We got ours at Peppermint Baby Boutique in Richardson. I couldn't quite understand the directions so they taught me how to use it. 5 minutes with them made all the difference. Also I do have a Baby Bjorn type carrier, but the sling doesn't hurt my back/shoulders like the front carrier after 30+ minutes.)
This time around I also prepped food and kept it in the freezer. I knew I'd be too tired or sore to cook for a bit. My husband is a re-heater. He would rather buy food than do any prep.
Looks like you got good pointers on the sibling jealousy or feeling unloved. Even my 6 year old went through a tough time feeling unloved once her brother was here. Also when folks come to visit the baby, ask them to pay attention to your son first. The baby can wait.
This second time around my husband did a great job of running interference, too. Instead of letting us be bombarded with visitors he had folks wait about a week after we got home from the NICU. (Yeah, our birth didn't go as planned since my son was huge and my body hadn't grown there to make room. Oh well. We did what we had to do to survive and be healthy.)
If this is your first birth, take a Bradley class even if you aren't planning to go all natural. I was turned off by the naked birthing in the books, but those are really old photos from the 70s. The information was so valuable. My husband was great last time, but he really didn't know what to do to help me during labor. This time he was much calmer and felt like he knew what to try. Also if you are thinking of using painkillers, this is the time to get the information about the risks and side effects. During labor you will be too preoccupied to weigh any risks vs benefits. (I like having information, too, and I really wish I had taken this the first time. We took with Linda Worzer of Natural Beginnings) I really like that my husband was so valued and respected in this class.
Also remember you can get nice things on Craigslist and garage sales... as awesome as some of the baby things are, you will only need them 6-12 months.