Taking over care of an orchard, what would you do first?

I have been given the opportunity to partner with a farm and take over an established orchard of mostly apples, with some pears and plums. They are in standard rows, multiple varieties interplanted, but no mulch and just grass under them. Theres the occasional garlic chive. He reports them producing pretty well. Not a lot of disease/fungal pressure, and he reports good pollination. I presented the idea of planting black raspberries between the trees to improve biodiversity, and the response was a little hesitant, because he wants to make sure we can still get around the trees and tractor chickens through. Which is great consideration, but I’m a little worried about having good options to improve the overall ecosystem. They also dont mulch, or compost, they just rely on chickens to feed the ground. I am hoping to do some composting and utilize a wood chipper to start better feeding the soil. I just dont want to start friggin’ terra-forming the place on this old farmer. I want to focus on one positive step in the right direction at a time. And in general, it will be good practice to only change one thing at a time anyways.

The farmer is pretty on board with most of what I have to say, and is willing to let me do just about anything within reason.

What would your words of wisdom be for me? I have loads of book smarts on this subject, but this will be my first hands on orchard and permaculture adventure in this sort of setting.

Much thanks!