I would wait until the paci-longing is totally gone before you take another thing away. We just took the paci away from our 2yo 3 weeks ago and she doesn't ask for it anymore. The paci's have long been in the garbage (we had 4 of them). We will start potty training this next month. I would just do one thing at a time completely.
As far as milk, well, he really doesn't need milk. I'm probably one of those few that view cow's milk (if that is what he is on) as really bad for the body. It's very mucus forming...ear infections, cold, sore throats, etc. He can get calcium from better sources. Or if you want to continue him on milk, just take him off milk for a while so you don't have to give him the bottle at all. Then once he is over the bottle, resume the milk back, but this time in a sippy cup.
Once you are sure you want to do this, throw the bottles away so you won't be tempted to give it back to him. I nursed up until a year and then switched our daughter to a bottle. What I did to prepare my daughter (we did this when she was around 15 months?) was talk to her about how she was a big girl, etc., and then I had her help me put the few bottles in a plastic grocery bag and then my neighbor came over and I had my daughter give her the bag.
Maybe it was too easy? She didn't have a problem with it...we just reminded her if she asked for it that it was gone-gone. The same thing with the paci..except this time, we really couldn't find them (we found them the next day, but I trashed them) and she knew we couldn't. She asked about once a day for the paci for about a week and without any problems...thankfully! I think she is just really easy.
I hope this helps a little.