I commend you for taking on music braille!
There are some resources you can find online. The Music Braille Code 2015 is an invaluable tool that is useful for any level of music braille transcriber.
I'm also glad to hear that you've been watching the webinars! We've been enjoying presenting them so I hope that they are proving to be helpful!
Some resources I know of are: (and I'm not in a position to endorse any of them but these are the ones available that I know about !)
How to Read Braille Music by Bettye Krolick https://www.nbp.org/ic/nbp/MUSIC.html
Who's Afraid of Braille Music by Richard Taesch and William McCann https://www.dancingdots.com/prodesc/whosafraid.htm (Dancing Dots has other resources and training as well)
Feel the Beat by Christine Short https://www.aph.org/product/feel-the-beat-2/
Also, most of us music transcribers are always happy to help out in providing transcriptions for music students. Don't hesitate to reach out if you need assistance or have questions as you go along.
Hope that helps!