Hadley School for the Blind has free online classes.

It's a bumpy process.

My wife had a tutor who helped her. Her vision didn't go until her 30s. She spent some time learning the ABC's. We also would go to the library and check out braille books from the children's section. That's a basic start. I don't know about braille displays. I know this isn't that helpful, but it's what I can offer.

I'm an Assistive Tech Specialist based in Australia - I can give you some recommendations if you're interested!
A short summary would be that learning to read Braille is a long process and you might find a Braille display to be slow and annoying to read at first.
There's a small, low cost Braille display called an Orbit (though I don't know if it's still being sold).
There's another small one called the SmartBeetle which is a really solid little guy. They're about $1,400 USD.

I'm following because I want to learn braille too.

I just finished the first Hadley Braille adu

I recommend doing the Hadley courses since they’re free. Braille isn’t as hard as people make it out to be. Just be sure to practice reading for at least fifteen minutes a day so you can build up reading callouses. You can get books from the National Talking Book Library in braille to read for free white you’re learning. I would do that before spending a few thousand dollars on a note taker just yet. If you have access to anything like Vocational Rehabilitation they can help you get connected with a braille teacher. Knowing how to read already will help and the updated UEB code makes a lot more sense with that background.