OK, since you don't have a coop yet, check out the coop threads here for ideas. It does NOT have to be fancy, the chickens REALLY do not care. Plenty of room and PLENTY of ventilation without drafts on the birds are the key features. And 1/2" hardware cloth covering ALL openings. Do NOT use "Arrow staple gun" type staples to fasten it. Use poultry/fence staples, screws with washers or battens fastened with screws through the hardware cloth to the frame.
Oh, and start the coop early because chicks grow FAST and you want them out in the coop not in the house.
And another "Oh". Check out the Mama Heating Pad thread. FAR better brooder than a heat lamp.
https://www.backyardchickens.com/th...d-in-the-brooder-picture-heavy-update.956958/