Q.I Am Planting A Dwarf Red Baron Peach Tree In Large 24”X24” Redwood Container And Need To Know Best Soil Mix. I Live In Zone
9 near the ocean. Location is my sunny patio, protected by patio wall. Peach tree root is wrapped in large long plastic bag. The branches look healthy with tiny nuns on branches.

Certified GKH Gardening Expert
Peach trees in containers need a well draining soil, such as a good potting soil, with compost added. You can add perlite if you think the potting soil needs more aeration. Make sure the containers have several drainage holes.
These articles should help:
https://www.gardeningknowhow.com/edible/fruits/peach/growing-peaches-in-containers.htm
https://www.gardeningknowhow.com/edible/fruits/peach/grow-red-baron-peach-trees.htm
https://www.gardeningknowhow.com/edible/fruits/peach/peach-chill-hours.htm