The most important part of controlling your environment is tent placement. You want a space that is easy to vent to the outdoors and get replacement air in. If you have to run a tent in a closed space you will need a dehumidifier, if the Lung room (the room the tent is in) is large you may need a separate heater or humidifier depending on the source of your air. Plants must have fresh air.I do want to start small. Maybe only one plant at a time. Is there a size you recommend?