1yr Weaning Help

Somebody pleaseeeee help me with tips how to wean my son. He’s 11 1/2 months right now and I’ve given him a little whole milk in his sippy cup with breakfast a few times . But for some reason him relying strictly on foods and not breast milk is stressing me out and I’m not sure why. When and how much milk do you give your little one during the day? I know night feedings will be most difficult, and im trying to wean him because soon I’ll be trying to get a new job as I’ve been a SAHM since he was born. Thank you in advance!