you will get mixed comments on this but generally you dont wanna give nutes until 3rd true leafset, some people will give it at the fitfh set, some people as soon as a sprout comes up, 3rd leafset is a safe bet though, but never before sprouting. Also i wouldnt put them under lights until they sprout up either, all a seed needs is a little moisture and darkness and around 80degree temps to crack its shell and start its journey, dont plant seeds too deep, either, if using a peat plug or any kind of starting cube/plug just drop the seed in the hole and use just a small piece of the plug or medium to cover the seed loosely, in a sense you could think of the seed as an infant child, you dont wanna drown it (not too much water) you dont wanna smother it (dont pack it in under the dirt, just let a very lite layer of medium cover the seed until it pushes its way out on its own) and dont feed it anything other than designated "baby formula" (there are rooting compounds/ boosters you can use to soak your starter plugs/medium before dropping ur seed in, these are not required but can help speed up rooting, these are generally used for cloning though, less so for popping seeds but can still be helpful.
I currently use an EZ cloner and only pop seeds when i need/want a new mother plant but back when i used to do every plant from seed my process was as follows- i would soak my rapid rooter plugs in a lite K-L-N rooting compound- well water mix, ring them out so they aren't over saturated, drop seed in the hole, tear off a small piece of the rapid rooter to cover the seed with, then put the rapid rooters in a plug tray, inside a humidity dome, with a thermostat controlled heating mat underneath set to 80 and to ensure i was actually getting that temp to the seeds i would take a spare rapid rooter and stick the sensor probe in it and put that into the plug tray as well. then its just a matter of misting the dome every other day until i had baby sprouts then id turn the light on.
hope this helps! just remember everyones grow is a lil different and there's a million different ways to grow, just gotta figure out what works for you!