What did you moms do once your baby turned 1, about bottles and sippe cups and from formula to cows milk?

I’m a FTM and my baby just turned 1. He is formula fed. My pediatrician told me I can slowly transition him from formula to normal milk, or I can do it cold turkey. (He said whatever I wanted to do as long as baby was off formula by 15m) I forgot to ask him, if I’m doing the slower transition, should I take the bottle away and start giving him a sippee cup immediately or what? I’m just so lost. Cause I see some people say they don’t even give their baby a sippee cup but my baby isn’t the best at eating table foods yet so I know he would still need milk for calcium. Ughhh I’m just so conflicted on how to start and what type of cup to give or give him no cup for milk. I just don’t know. Any tips or advice or what did you guys do once your baby turned 1?