Looks like you are doing the research ond off to a good start.:cool2:
I do not check the soil surface when watering, I have much better results by slightly tilting the pot and checking the weight. You will have much better results, especially with seedlings. I would guess after a good watering, those small plants in big pots could probably go a week without water. MJ like to nearly dry out between waterings, not to the point of wilting or drought stress, but if you are checking the weight of the pots daily, you will know when they need water. Also, plants grow at different rates, do not get in a habit of a 'watering day', treat each plant like the individual that it is
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Your temp and humidity are fine, some strains are more heat resistant than others, but as a general rule, try to keeps temps at 85 or less, IMO 70-75 is optimal for seedlings.
Your light output is fine too, not optomized, but a good start for your first grow
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Tell us about your soil and what you intend to use for nutrients when the time comes.
Relax buddy, don't concern yourself with yield on your first grow...concentrate on keeping them happy and enjoy yourself...growing is as much about stress relief before harvest as it is after