TIDY UP - I completely understand that you just brought a little human home and babies need so many things! And these new things are probably scattered throughout your home. If you can, please tidy up in any rooms that we may use during the session. Your bedroom and the nursery are popular spots, if they have ample light. Make the bed, pick up any random bedside table items, etc. Less is more. If conditions are good, we can also venture outside.
AWAKE - Try to keep baby awake for a couple hours before I arrive. Give baby a bath, play with baby, tickle his/her feet. It will help assure that baby will be tired when it's time to sleep for the session.
FEED - I recommend feeding baby right before I arrive, that way we have the best chance of a cooperative and happy baby during our session. As I mentioned earlier, if we need to take a break for feeding, no big deal!
WARDROBE: As for what to wear for mom and dad - I suggest something simple. Solid colors are good - patterns or wording kind of take away focus from the baby. (: As for baby's wardrobe, a plain white onesie is nice or I have some neutral wraps I will bring. Or some people just prefer a diaper or diaper with a cover. I HIGHLY discourage putting the baby in any complete outfits (pants+shirts, dresses, etc.). Newborns don't fit in any clothes very well and they just end up being baggy/awkward and covering the baby's face and cute features. Newborn sessions are about the newness and tiny little features - clothes cover all of that up.