Transition to milk

Hey everyone! My little one does not have his one year appointment till two weeks after he turns one. I'm a first time mom and so I don't really know how to transition to whole milk. I would ask the pediatrician, but I don't want to wait that long to transition. So please share with me how you do the transition to whole milk. Is it a gradual thing? Is it to replace the bottles? Is it looked at as a nutritional thing like formula or just a drink like how we as adults treat milk. I know some of these are dumb questions. But I really do not know anything when it comes to this transition! Thanks everyone!