Msbluesky if you prefer having at least 1 week to yourself after birth, then tell people-wont kill them and it helps you prevent any unnecessary stress.
With both my children I asked friends and family not to visit in the first two weeks. Im sure i pissed a couple of them off, but I'm also sure they got over it pretty quickly! I found these first days absolutely magical and loved being in my little baby bubble without any distraction from the outside world.
Whilst milk only comes in on day 3-5, both my children spent hours sucking right after birth, in fact DC2 never really let go of my boob in the first week. It is difficult to predict how your baby will establish nursing, but the last thing i would want to have on my mind in these days is a visiting schedule.
Maybe I am particularly disorganised, but I remember after birth of DC1, I was so incredibly busy trying to find my feet as a mum (plus VERY tired) that when DC1 was asleep, i was facing the choices of either taking a shower, eating or sleeping. Serving tea to visitors was definitely not on the list-and having a nap myself was usually the first choice.
The only "social" activity i did in these first days was going to a bf group. DC1 and DC2 both latched on very easily and i have enjoyed bf-ing, but it was important to me to have a lactation consultant check whether latch is indeed ok as it really makes things difficult if it is not. I also got great advice on different bf-ing positions there, plus it was great to chat to other new mums.
I also second the advice to get as much information as possible on bf-ing via eg kellymom to beef up your arguments when your MIL is giving you a hard time. Or just to gain confidence so that you are not run down by the (I'm sure well-meant) advice from "experienced mums" who did things differently when they had their children. It is your baby, and you know best how you want to feed and raise your child. Good luck!!