Hi Craig and welcome. There’s a brilliant allotmenteer called Pete who posted on here some years ago who is based near Beverley, running three plots (I think) specialising, amongst other areas, in green manures. Search for those posts as they may be of use to you. Try “green manures”.
All Charles books are fab, and check out elliot Coleman and Bob flowerdew too, all with lots to offer.
Lots of hard work ahead, wishing you the best with it. Tris