Hey there - nothing like preparing ahead of time!
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You've got lots of time before 12 months, so it can be a nice gradual process. Much of the answers to your questions can be personal choice, so I'll just give my input. Have you checked out the weaning threads on this board too? Might get some ideas there.
First, milk of some type (BM, EBM or formula) remains extremely important for the first year (or 9 months depending on where you live, but for me it's at least 1 year). So, if you're dropping a BF, you want to replace it with EBM or formula for the first year. If you check out the solids boards, I think they talk about how much milk and how many feeds once you start solids, and so does the bottle feeding board.
As for dropping the nursing sessions, if it's done gradually (no faster than 1 feed a week or thereabouts), things like engorgement aren't as much of a problem. If you do get extra full and feed uncomfortable, you can express off a little bit (not a full amount or it just tells your breasts to keep making that much!).
If she's taking a bottle now, you can either stick with that, or move to a sippy cup or a straight cup (some babies close to a year do fine with either). We never bothered warming the EBM for my kids, and went straight to a mix of cow's milk after a year and didn't warm that either. Some moms prefer not to give cow or sow milk at all - once they stop BFing, they just make sure dairy, vit D etc are provided in other ways (I found cow's milk just easier!).
You can really decide to start weaning a month or so before you want to be finished altogether - or more - or less! Many moms continue to BF only once or twice a day for just ages. I did twice a day for about 8 months, I think (it was after a year) and then just 1 nursing session for several months, and we just weaned a few weeks ago (at 2).
So you have lots of options and there's really no one right way, I guess I'm saying! HTH!