Sorry to be slow in responding; just returned from the TX hill country south of San Antonio. Depends on a number of things including how much "free" help (family) and equipment (e.g., mower /sprayer, etc) you can muster. If it were me, I'd try to do it right ... from planting to harvest. I'd start with a tad more than an acre (45,900 sq ft) in an east-west layout including 3 rows of 18 trees-per-row spaced 30' apart with 30' between rows and a 15' buffer strip on all 4 sides. I'm a Dunstan fan ... they make big chestnuts and have solid reputation (marketing hype) that might assist sales. I would not buy 54 grafted trees (grafts fail); instead, I'd buy 4 lbs (more than enough for 54 trees) of the largest nuts available from Chestnut Ridge of Pike County to direct seed in the fall and spring. Be sure and call him
(217) 242-5281 and ask that they not be "heat treated." Half of the chestnuts would be stratified in the fridge until spring in moist paper towels in sanwich bags (works great for me).
It's probably best to prep the orchard area before planting if you can; reduce as much vegetation as you can, or at least mow it as short as you can.
Assuming you don't have much help, I'd direct seed half of them (27) in the fall and leave a planting slot for a spring planted seed between each of 2 fall planted chestnuts. For each chestnut I work the dirt pretty fine (2-foot dia x 2-feet deep) to assist tap root development, place the chestnut on it's side (radical pointed down if it has one in the spring); then push a landscape pot (black plastic pot with the bottom removed) over the seed and push it a couple-three inches into the soil. I buy the cheaper 4-foot landscape fabric; use a 4' x 4' piece on each seed; and cut a hole big enough to place around the pot- (fold the fabric in half and cut a half moon). I place pea gravel 12-18 inches all around the outside edge of the pot and mulch on the rest of the fabric (I get good mulch free from my city). , I add 3-5 inches of straw mulch over the seed in fall plantings ... and add round piece of hardware cloth (1/4 x 1/4 inch) inside the pot over the seed (held down tightly with a landscape staple). Be sure to water any direct-seeded nut generously at planting to ensure good contact with the soil ... in the fall, you don't want air pockets in the soil. I*'d start caging the27 you plant in the fall if your deer density numbers are very high; you'll need the cages in the spring when the tree starts growing.
Tired from travel; signing off now .... I'll add some additional thoughts later. I'm sure others can add helpful comments.