Leave the lid off and put a screen over it.
Better yet, do not use plastic at all. It is too hot.
If you use a dog kennel, you'll need to put cardboard or wire around the bottom, or the chicks will walk right through the bars.
Welcome to BYC. I started with adults, but if starting over I'd start with chicks. I only have one of my old girls left but she has blessed me with a multitude of chicks in her time here.