My old man was 'trimming' back an old pomegranate tree we have, and he managed somehow to dislocate this whole branch from the tree

I cut a lot of the thick branch/truck off because it was too heavy to stay in the pot.
I'm hoping it survives!

Just wondering a few things, a. how can I possibly ensure it survives? (Please note this branch had ground layered somewhat and has quite a few roots, though very few fine ones) and b. where can I potentially go in terms of Bonsai?
Any suggestions/idea's welcome! (Bear in mind I'm a total amateur)

