I'm taking over my mother with Alzheimer's finances and housing and need legal help. Where do I begin?

There are so many things that you need to put in to place. You may want to seek the services of a geriatric case manager to get all your stuff in order in a short period of time. This guy has a great rep and may be able to help you, I have used him in the past Donahue@caregiverrelief.com.
You really need to to make sure that you do things so that other family members will not come back and give you a hard time later. Families get so ugly.

Diane

I started at my mother-in-laws bank. She and I went in and she made sure I was put on her account so I can sign checks, pay bills, etc. In our situation, I eventually wanted all three of her sons to be on ALL of her accounts even though it's only me that pays the bills. I just wanted everyone to be satisfied that they had the right to check up on what I was doing at any time. Also, I set all her bills up to be paid online, so it's a lot easier now. Again, I gave the boys the username & password they would need to see what's going on. I've seen too many families torn apart because of money, it's not worth it to me. Good luck.