I think it's hard to give a target number without knowing your weight. I'd go for 2000 to 2200 immediately PP depending on your size and tweak from there. Avoid going too low, especially while you are getting your milk supply going. (this is not professional advice, this is message board advice) IMO, you should spend the first couple weeks home from the hospital resting and breastfeeding, not so much journaling.

Also be sure to check out the pregnancy/nursing subforum. Congrats on your impending kiddo!