If you can, free range until you figure out what works for turkeys as far as feed goes. Pretty sure wheat being optimal does not mean oats aren't options. Turkeys live on acorns and bugs in the wild; I'm pretty sure they'll eat oats just fine. Truthfully, they can live on and enjoy about anything.
I've never had a problem brooding turkeys with chicks and even ducklings. If anything, the extra early socialization seems to help them all get along in a mixed flock.
Other consideration is breed, which depends on space and purpose. I love turkeys as pets but am open to the idea of eating them. I have four BB turkey poults at the moment (two bronze, two white). We'll just eat anyone who doesn't get along or have much personality. If you're after pets, go heritage (and, in the event you want to eat one, they taste better according to all the taste tests). Heritage has far less size and breast meat and takes longer to get to 'eating size'. Broad breasted breeds, however, have a plethora of health woes, short lifespans, can't breed naturally, etc.
Good grief, I totally forgot about blackhead. I actually had that on a list of things to do, sitting here on my desk and I got so excited about Turkeys I forgot. Just found the list behind my desk, when I redid it I didn't add blackhead back into the mix.
I know they are more fragile, one reason I did not want to get them before Sunday b/c we will be gone most of the day Saturday and I want to be around to keep an eye on them. My feed is 21%. I need to e-mail the Fertrell nutritionist anyway and will ask the best way to increase that protein. I wonder if during Turkey snuggle time I can just give them a little extra in the form of scrambled eggs? I do know that on the Fertrell website they have recommendations to adapt, but it is a different recipe than where I get my feed and in 2,000 lb. batches, a little more than I need!
The first thing to look into, call the county and ask if blackhead disease is a problem where you live. If so, keep them away from chickens. Likely not a problem, we have several Indy members. Blackhead will kill turkeys, chickens can carry it unaffected.
Temps, not higher but consistent temps and draft free for sure. Poults are fragile the first week. They also will drown themselves! I use rocks in the waterer to prevent it.The important point in feed is higher protein. I use 24% game bird type starter for my poults, guinea and ducklings. Having a chick tutor in with them really helps them learn eating and drinking, most catch on pretty quick tho. I brood chicks, poults and keets together, no issues unless its BB poults. Then they are just too big.