Hi and welcome to BYC - great to have you onboard with us. I'd suggest waiting another couple of weeks before posting your pic on the What Breed or Gender is This? forum.
If you are going to give treats to chicks, make sure that they have access to grit before you do so. They need this so that they can breakdown food in their crop.
You'll find lots of info in the Learning Centre https://www.backyardchickens.com/atype/1/Learning_Center, and if you have a specific topic in mind, just type it in the search box - there's a wealth of information on past and present threads.
It's better to keep it on chick feed. Chickens get spoiled easily and like kids will learn to gorge on treats and avoid their nutritionally sound poultry feed. Treats should not exceed 10% of the daily ration.
PS chickens are flock breeds - they do much better with a buddy or two. Do you plan to get more chicks or is this one meant to be a house pet? You might check out "people with house chickens," thread.