Guilds/forest garden

I live in central Texas about 30 miles east of Austin. We are in an area they call the Lost Pines because it is a small area that is really more like east Texas than the Post Oak Savannah all around us.

I have 2 peach trees, 1 pear and 2 apples planted in a zigzag about 15 feet apart and would like to know about setting up guilds around all 5, hence getting a super guild.

I also have an area I call my "woods" because they did not cut down the trees back there when they cleared the land for this house I bought. There are Hackberries, Cedars, Mesquite, Western Soapberry, Gum Bumelia and Cedar Elms of various sizes and ages in this area. It comes up to about 15 feet of the end of the septic field. How would I set up a forest garden in this?

Thanks all in advance

The answer what you can plant is easy but also bears one mistake many do.

The right approach is what would I like to eat (or family)
Then know how the tree canopy will develop and where are spots with shade or dappled shade in the future.
(I was is Pasadena once and it's warm in Summer with relatively fair winters, hence things grow faster than in the north)
Last is to know can your chosen plants grow in these conditions and even better if they are companion plants for your fruit trees.

A complete guild or single guilds make no difference beside all nutrients and water will probably better distributed to the benefit or all trees and plants.

If you not touch (control) the spot a guild creates by itself (not so neat arranged and sure not the plants you want. But definitely its a guild too)

One thing you need to make sure that you not raise the soil around the planted trees as they may struggle and in the worst case they eventually die, because the roots are too deep.

Mother nature's solution should be found in your "woods".
Check what's there and what has died over the time.

A fallow piece of land will develop.
1st the pioneers like nitrogen fixer and ground cover like grasses
Small trees getting platend by all kind of animals (squirrels, bird dropping...) and one day they will outgrow the pioneers and grasses, that's your forest.
Because mother nature always creates a forest as final product. You are just fitting it into the forest you want.

Hi Robin - welcome to permies!
It sounds like you have a lovely place there - See Hes has given some great information.

I think looking at the natural wood there and what grows naturally is a good starting point. You know that it will like your area for a start! Anything that you like to eat, or has another use (like biomass, nitrogen fixing etc.) could be encouraged to spread into the areas round the fruit trees.
Then I would look at other useful perennials that like your area - herbs, perennial vegetables, insect attractors, pest decoying plants, Nitogen fixers, and source these.

We've got a few threads on converting established woodland and forests to forest gardens, for example:
https://permies.com/t/155012/Forest-garden-forest
https://permies.com/t/160729/Adding-existing-forest-starting-scratch
https://permies.com/t/5957/woodland/existing-forest-Permaculture-Design

In Texas I guess you are able to leave more trees for shade, but you may still need to do some clearing to create edges where the productivity tends to be.
Wishing you well.

At the end of the septic, sound like a good place for a pollinator garden.

That might be the septic drain field and not good for edibles.

Fruit tree guild could be Daffodils, garlic and chives to suppress grasses.

Elderberry, Blueberry, Raspberry, Nasturtium, Mint, and Peas would make a good fruit tree guild.