Hiya Mason, Welcome to the forum!
I'm sure you've already tried this but just did a quick google and found some things that might be helpful:
- https://www.nottsdeaf.org.uk/bsl-level-1/
- https://signcore.co.uk/
But I think a good start is just the alphabet, you can find loads and loads of resources and because, I don't think, there's a regional difference, they should all be pretty much the same letters - I find the game on this site where you guess the fingerspelt words works super well too