I use a vent fan (AC Infinity Cloudline) that has an automatic controller for temperature and humidity. The fan turns on and off as needed to keep the tent within the temperature and humidity range I choose. If you do not have a controller for your fan I would use a timer so it runs whenever the lights are on. Then adjust the fan speed until it maintains the tent parameters you want. Keep in mind that putting devices like a heater, humidifier or dehumidifier in your tent is very difficult since the fan will be fighting them. The vent fan can remove air faster than those devices can heat or humidify so it is easy to over vent and your tent and blow your freshly humidified or heated air out of the tent. This is where an automatic controller really helps since it only runs the fan when needed. Don't get overwhelmed. Growing is actually pretty easy and your first grow is the toughest as you have to learn everything. Future grows will be easier and almost guaranteed to produce more as you learn.

An inkbird temperature controller helps