A few things we did when we had our second daughter (our children are 28 months apart)
Put our daughter in a big girl bed months before setting up for the new baby- so she didn't see a connection between getting "kicked out of her crib" and the baby coming :)
Got her a "big sister" t-shirt..which she was excited to wear.
When our second daughter arrived- my husband and I still made sure to spend one-on-one time with our oldest- even when we were exhausted and sleep deprived. Reading to her, playing games, etc.
We made her a "helper" ...she loved grabbing a toy for baby, or helping with bottle feedings.
Also got her a few presents- since there was a lot of new things for baby...this way she got some lovies too :)
There will be some jealousy...and there is really no way around that. He's had your complete attention for the last two years..and now it's going to change...but that's okay- he WILL adjust :)
As for books for your son- one of my favorites is "The New Baby"...talks about Mrs. Bunn (bun in the oven..lol) who is having a baby...some of the preparations getting ready, as well as what happens when they get home ( and I SWEAR it must have been written by a woman- because it says something like .."When Mrs. Bunn and the baby get home, they will need lots of rest, and help from Mr. Bunn and the kids...") You can find ____@____.com (I happen to be a consultant for the company now...I loved all the publisher's books so much!!)
BEST WISHES to you on the final stretch of your labor! Hope you are feeling well- and wish you a smooth, safe labor!!
D.