Look for Jamy Abersold and the records tracks about than book, to play together the records. I remember that tracks have a division in stereo, so you can play together with styles different. I think this is a best way to train alone.
You can find too book about pianist standards, I particulary like so much monk, and you can find a book with much of themes.
Too improvises me like to studies melody and rhythm of theme and start at this point develop variations. Play a piece like theme and variations to understand better.
You can find all that this on internet (pirate).
And the free way (

)
https://www.outsideshore.com/primer/primer/ https://www.jazzbossa.com/ (same that have above this, but in Portuguese (with links to Italian and Hungary, I think).
I hope which help you. (English is not native to me)

edit:
I read again you post and remember me others things:
If you do not know nothing about jazz, start listen this (you know how this work?). The 2 or 3 first books the Abersold explain this, how jazz works.
I like so much the documentary ‘Ken Burns’, I don’t know name in English, but him made just one doc about Jazz (12 hours).
And back to blues, I remember to hear all great jazzs say ‘the soul of jazz is the blues’.