Typically they at 6-8 weeks should do ok. Can add heat source if have access to safe one like K and H Fireproof heating pad from Amazon. If not maybe put in enclosed coup once fully feathered and weaned off indoor heat source if have one. Another heat source could be heated water bottle in thin...
If 3-4 weeks or older can. At this age I typically start with a few treats like handful of greens like cabbage etc. or dried mealworms as high protein. I know you may have to adjust as in a different area. Here is chicken treat chart for approved foods to feed but remember keep 10% or less of...
Here is link. Here can get from My Pet Chicken.com , Tractor Supply, and Amazon. Other sites sell as well.
https://www.google.com/search?q=sav+a+chic+electrolytes&ie=UTF-8&oe=UTF-8&hl=en-us&client=safari#lbl=OVERVIEW&pie=plaji-i
Brood separately. They will have different needs especially temperature 90-95 degrees first week and wean by five every 5-7 days till 65-70 degrees then out when fully feathered 4-5 weeks but may keep in brooder till 6-8 weeks as colder season. Hope you have 20% starter, starter grower, or...