The chicks actually don't know that you're the one that feeds them if you have food always available, you're just an intruder. I'll just tell you what I do, and you can take from this what you want.
From day one of arrival, whether that's hatch day, or whatever the case may be, I wear the same jacket whenever I interact with chicks (a brightly colored obnoxious green-orange-blue-purple-black) and a red knit cap. They learn to recognize that I am the king chicken. I use a whistle. I use only three different sounds, one is a soft whistle to let them know i'm close by, one is single high pitch meaning feeding time, one is screeching loud three times, means come here now, that's the urgent Armageddon whistle - predator alert. I start chicks off learning the feeding time whistle when I bring them live amphipods, any live small bugs will do though, handfeed the ones willing, and show with finger tapping where to find the bugs for those not yet ready. By 48 hours old, chicks have amazing visual acuity, and can detect the smallest of movements. It takes no more than a few days to have all the chicks sitting in my hand and eating from my hand and I'd say amphipods are the favorite meal around here, ducks love them, chickens love them. Hand feeding is the easiest way to train any animal. Live food is better, it just is. From week one, a minimum of once per day, I sit with them in Fort Nugget - the enclosed run, in an enclosed pen, essentially a modified puppy playpen, or pet exercise pen inside my run, as they don't need access to the whole run, you could also do this indoors, I do this indoors as well because it helps me train my dogs that all poultry belongs to me, mine...mine...leave it. From week two, I take about 4 at a time and put them in, well i actually don't know what i'd call it, but it's similar to a baby carrying pouch/pack. I made it when I had hatched a single duckling that imprinted on me, so I had to carry her around everywhere with me. It has a mesh screen so they can see as they are being carried around outside while i get things done, usually out harvesting something, it helps to get them used to being picked up and carried, becomes second nature, enforces my ownership of them with all the other animals, everyone understands they're mine. Predators are all too common here, we live on a remote island, and free range here is free range so it's important to train my animals to know when predators are about. The bald eagles make this easier to train because they are vocal when they are here. My dogs respond to the predator whistle by barking and looking for vermin (or barking and clamoring for the door if they're indoors) and the poultry come flying back to their run, because if they don't, they'll surely die. If not trained to return to their run when a predator comes, they will instinctually run willy nilly in a panic, and a single animal will become a target of a predator. I don't train my poultry to be friends, I train them so they will live. My land, my rules. Hope you find something in here helpful.
Hard enough making sure all 3 dogs get my equal attention, and then add the other pets that all need caring for, in addition to being at our local animal shelter 5 days a week. Need more hours in a day! 
