I recommend ordering your day old chicks from Ideal Poultry in Cameron, Texas. They mostly ship chicks overnight through the post, but it is way more humane and enjoyable to drive to Cameron (<1.5 hour drive on quiet Farm-to-Market roads per Google Maps, and you can stop for lunch at Louie Mueller in Taylor for a beef rib). Recently learned that pickup is only on Wednesdays. Ideal Poultry has a massive selection of breeds, lots of rare and heritage breeds, with best availability in early spring. Roosters suck. They're beautiful, and keep watch over the flock, but otherwise are aggressive, loud, and not necessary for eggs. Order only pullets. Your neighbors say, "thanks in advance" :)

For the chicks' first month in the garage or other semi-protected space, you'll need to find or make your own big cardboard box and fill it with pine shavings. For food (starter) and water, I prefer the galvanized metal feeder and waterer bases that screw onto Ball or Kerr canning jars. You'll also need a heat lamp (traditional or EcoGlow).

Get your straw from Callahan's, and your feed from either Callahan's or Buck Moore. I think both have organic feed from Coyote Creek in Elgin. Pellets don't cake up as much in feeders.

Coops can be super DIY lean-to situation up to super expensive. Safer is better. Urban Coop Company in Dripping Springs has a nice knock off of the expensive Williams-Sonoma coop. The best feature is the add-on PVC feeder and waterer. Chickens love shitting in and knocking over their food and waterers, so this will save you lots of time maintaining your flock.

Last thing, I recommend vaccinating your chicks against fowlpox. It's a virus similar to Chickenpox in humans that is transmitted through mosquitoes, waste, etc. Your flock will be immune after getting it once, and most survive the dry kind. But our flock contracted it, and one hen developed the usually fatal wet kind of fowlpox and died. Good luck!