My ex & I separated when my daughter was 9 mo's old. I was already weaning her from breastfeeding. But, even w/ that, I'd already been pumping since I had gone back to work full-time. You may want to start pumping to build up a supply if you haven't already done so and/or wean the baby off the breast.
In regard to visitation, I'd suggest contacting an attorney - get all your ducks in a row. You may not be able to move out of state w/o his consent.
My arragements were Saturday morning 10a to Sunday 5pm. He also saw her for a couple of hours Tues & Thurs evenings. It was difficult at first, but eventually got used to it. I had to accept that he is her father & as much as I didn't want to have to ever deal w/ him/see him again, it was important to me that he be in her life. This arrangement continured until age 4 when she started going from Friday evening (he picks her up after work) to Sunday 5pm. He gets her for one week each year for vacation (goes to 2 wks this next year). He still sees her one to two evenings per week.
Thankfully, for my daughter's sake, he's always been good about seeing her. You have to get to the point where you see it as a business relationship - the business is raising your child. Trust me, it still gets to be a PIA every now & then - my daughter is now 6 - but you learn to cope. And you'll hopefully reach a point where you'll come to look forward to your free weekends to take care of YOU.
Good luck!