How do I go about doing a POA for mom's financial needs and speaking on her behalf. Where do I begin?

Where you begin is with your mother. Only she can give you Power of Attorney to manage her finances, and to make decisions on her behalf.

If your mother can't do that - perhaps because it's too late? - it gets more complicated. And expensive, alas. Would you like to say a little more about what's happened?

I thought I had to go to a courtroom and ask there .. finding a lawyer that is a challenge I guess I would have to go online for this not sure ..

Best way and most thorough is to hire a lawyer ideally one who deals with elder care. In my experience they don't tend to charge as much as other lawyers who might specialize in other areas . I am sure you will get more advice. We used one who was recommended by our accountant. They should help cover all the specifics you will need. Your mother does need to be of relative sound mind.