Over watering is the biggest problem most new growers have and it can ruin your grow fast. Plants need water, but too much will drown them, cause diseases and also attract bugs. My first few grows I tried very hard not to over water, but it's not as easy as you think.
Trust me on this, watering is key. I wound up buying a scale to weigh my plants so that I know exactly how much water is in the soil. Without the scale, I'd still be guessing to some degree.
As for your seedling, keep it damp not soaked! I've had 100% success with seed germination and use very little water, Infact a slightly dry day can do seedlings good too. You do not need to water every day, try going 3-4 days (or longer) until the cup feels light, then water lightly.
If you are unsure, play it safe and skip watering one more day... It's always better to underwater than it is to overwater, and some plants like it!
Congratulation on your state legalization, feels good huh? I'm in Virginia and we are legal as well, feels good.