Hi K.,
You have a lot of good information here, but just to share a few quick thoughts...
I definitely second the recommendation on the "I'm a Big Brother" book by Joanna Cole, if you don't have that one already. It's a really good book that's written simply and helps the bigger brother to understand his position.
Another thing that my oldest was excited about was we got both boys a "Big Brother" and a "Little Brother" shirt, which my older son got a big kick out of.
His preschool at the time also did a thing where they put a few simple toys in a box (some books, cars, puzzles. etc.), and when I was nursing, that was my older son's special box to go play in.
Having the baby give a gift when they first meet is a great idea too, although we didn't try that one. I will probably do that this time around when my third baby boy comes in 8½ weeks, to give both of my older boys.
Finding the right time and having the energy to spend that quality time with your oldest on a regular basis can be challenging, but if you can do it - even if it only works out for 30 or even 15 minutes every other day... DO IT! :o) You can only do what you can do, so just do what you can.
Best of luck to you!! :o)