So i'm new to this and i'm not quite sure where to start. I want to have a set up that control the heat lamps and switching them when its a certain time of day. Also I want a way to detect the humidity so at a certain level my auto mister kicks in. So my questions are what board would be best for this and what else should i look into.
An Arduino Uno should be sufficient. But it also depends on how many lamps you want to control. You'll definitely need to be more specific.
Using relays is a good place to start for switching your lamps. If you want to detect humidity, you could use a DHT11 sensor (can be found here on Ebay). You might as well need an RTC module to get accurate time readings.