I use plastic totes with most of the top cut out and replaced with hardware cloth for the brooder, then I use a heat lamp with a reptile heat bulb for warmth. You want a warm end at about 99 degrees for newly hatched chicks and the cool end at room temperature. As the chicks grow, you can raise the heat lamp to gradually lower the temperature at the warm end. They should be comfortable at room temperature by 3 weeks, and ready to go outside by 6 weeks.
There are tutorials on how to make an incubator online, but I purchased mine. Where are you located?