I would plant the support species now this fall.
Legume: Dutch White Clover (broadcast every where on the 1/2 acre plot, basically replacing all existing grass/weed/etc)
Mineral/Aerator: Tillage Radish (broadcast every where on the 1/2 acre plot, basically replacing all existing grass/weed/etc)
Biomass: What ever grass/plant/etc that is there that is mowed,
Pest Control: Garlic family for soil nematodes, mint/thyme family to attract the good bugs, celery/carrot family for good measure (I broadcast right under the tree, but for the mint/thyme family I transplant cuttings)
I recommend
aerated compost tea. My version is a bit more advance it has the following:
-Fresh/Local worm compost
-Local compost
-Milk kefir
-Amazake
-Aquarium Tank water or
pond water (contains purple non-sulphur bacteria)
-Soil from a wonderful lush tree near you.
-Insect, insect frass, chitin (breeds microbes and molecules that deter soft shell insect like aphids)
I take all of the above and put it in a
bucket with an aquarium
pump to increase the oxygen level in the bucket of water. I let it brew for 24hrs and then spray the leaves of the plants. Life happens and if you can spray hat day, you can just let it continue brewing up to 48hrs and spray the plants the next day.
https://www.youtube.com/watch?v=6fEzfpsmRlM&vl=zh-TW
When it comes to mushroom slurry. You make it by harvesting any mushroom that pops up in your garden or from a forest near you. you then "mash/blend' it up into a slurry, maybe dilute it if you want and then spread/splash it all over your site. These mushroom that you are now 'planting' into your food forest will trade with your plants and protect your plants.
When it comes to inoculating the roots of the trees that you have just both I recommend the following,
https://fungi.com/collections/mycogrow/products/mycogrow_soluble
But you could have just as easily used the mushroom slurry that we made above.
It is recommended that you dig a 3ft wide hole for your fruit tree, you then plan the tree, backfill and compact. Other than the already 3ft weed free zone, you don't need to kill any other weeds. And the weeds really aren't a problem. And with any luck the weeds under the tree are now legumes that is providing the tree with nitrogen, garlic chives which has tiny short roots which is protect the fruit tree roots from soil nematodes, and a nearby thyme/mint that is housing lady bugs and other good bugs. So the goal isn't to create a barren area but to replace the existing plant life with something that helps us.
And yes, when I plan in the fall, I hardly if every have to water the spring/summer, because fruit trees, now behave more like regular wild trees that fend for themselves vs like demanding pets that die without us feeding and watering it.