If unprepared, I would say to get a commercial non-medicated, but if you have solved your problem, good.
Personally, I find it costs too much to raise chicks until they sell, lay or to slaughtering age on commercial feed, so I simply grind up the grains I am able to obtain from the elevators near the river. Currently I have corn, milo, wheat, rice and a little soy. DH likes to add a scoop of rabbit pellets (so its not always completely self done), but heck, sometimes I get wild and put in dogfood too. But its mainly grain.
We also dry crawfish and crab peelings for a day or 2 and grind those up to the mix.
I didn't spend much on the mill. Its just a little handcrank job I found online for 20something dollars, but it does the job.
It doesn't take too long before they running around the brooder trying to catch bugs that were attracted to the light and when they start loosing some of their cuteness, they would attack grass, if its chopped small enough for them to get it down.
Don't get me wrong; its not all about saving money. I'm all for the natural thing too. It is good when someone comes here and is worried about what my chickens eat (mainly chemotherapy patients), if I have answers that please them. But it seems a lot of people are coming here because they want to get closer to their food sources.
I'm glad your chickens are doing well. 1st time chicken owner as well, and there is SO much to learn! Better to learn about chick feed next round, I think 
