We (my kids and I) are using a sparkfun RedBoard Arduino and are including pictures of the circuit along with each sketch.
Setup the circuit to match, and upload the sketch to try it out.
We had fun learning some programming topics while implementing an LED based ping pong game. Simple ping pong rules are observed, such as switching server every 5 points, and you must win by two.
For this project you will need quite a bit of extra materials, such as a foam incubator the DHT temp and humidity sensor, and some sort of A/C power switch to hook to the Arduino.