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Use one slightly larger than a shoe box if you have one. You can close the flaps or cut them off, depending on what you want. If you want to have a removable roof, you should leave the bottom on. Cut flat lines on two opposite sides. On the other two sides, go up to a point in the middle, like a roof. Basically, you're creating a triangle shape on top of a rectangle or square shape. For this part, you can use scissors. The roof should be a single piece of cardboard large enough to reach over the edges of the roof space. Bend it in half so it rests correctly over the roof angle. Use a pencil to draw where you want doors and windows. Use a craft knife or scissors to cut them out. For the doors, leave one edge uncut, so you have a door that opens and shuts. Use hot glue to glue the roof in place. Trace the glue along the top edges of the cardboard, and then set the roof in place. You can leave the roof off if you want a removable roof, as long as you left the bottom on for structure.
Pick a box to use. Place one of the open ends on the bottom. Create the roof structure. Cut out the roof. Cut out the doors and windows. Glue the roof on.