Don't water on a set schedule unless you are familiar with your plants' needs. Water when they need it. You are better off slightly under-watering than you are over-watering. No nute's for babies.
You can switch to any light at any time as long as you control the heat. I usually germinate and veg under T-5s. I go from solo cups to 1 gal pots. once they are well established in the pots, I move to the serious lights and then up-pot into their final home.