Here's a LOT of info on adoptive breastfeeding: http://asklenore.info/breastfeeding/induced_lactation/gn_protocols.shtml
There's info on the Newman protocol, where/how to get domperidone, other medications involved, etc. There is also a forum to communicate with other adoptive nursing moms.
You can get donor milk at http://milkshare.birthingforlife.com/ or http://www.facebook.com/EatsOnFeetsHome
Find yourself a lactation consultant that is experienced with adoptive nursing. Adoptive nursing is NOT the same as post-partum nursing. Someone not experienced with adoptive nursing could easily give you wrong information. I got bad information for Le Leche League. The leader didn't know what she was talking about and I think it kept me from attaining full supply (I was very close, but her bad info really derailed me.)
Getting the baby to breast will be your biggest challenge to start with. At this age, it may not happen. Your best bet is that the first time you try it you have a lactaid in place http://www.lact-aid.com/ Trying to nurse a baby this age without any milk/formula present could teach the baby that there's no reason to nurse at the breast.
I used to donate milk to an adopted baby. His mom successfully breastfed two adopted children without making any milk. She relied strictly on donor milk then nursed using the lactaid. I tell you this to let you know you have plenty of options even if you can't make a full supply of milk.
My adopted daughter is still nursing at 3.5 years. I started pumping to adoptive nurse when my bioson was 20 months old, so my experience was different than yours will be.
Adoptive nursing is a lot of work. However, it is so worth it. My daughter had less than 2 ounces of formula in her life. At 3.5 years she thinks it is perfectly natural to use a "night-night" (supplementer) to nurse. It is so sweet when we are in the shower and I bend down to put the bathtub plug in so she can take a bath. She reaches up and takes just a little sip from each breast.
So, with good support you should be able to do this. Even if you end up having to use mainly/all donor milk and she will only bottle feed, whatever steps you can accomplish will only be good for her.
Let me know if I can help you.