I found a Baby Blue jay, What should I do?

So my brother found a baby bluejay on the ground yesterday, so we put it in a shoe box with some paper towel and a warm cloth. We fed it some worms and a drop of water, and he seemed okay. But when I look up what to do next on the internet, everyone was saying that we were killing it by feeding and taking care of it, not saving it. So we found an old nest that we had, put him in that, and put him in a tree by the area we thought the mother bird was. He has feathers, and seems healthy but very hungry, and i`m worried the mother bird might not find him. I will do anything, even if it`s doing nothing, to help this baby bird. Please Help!!