First time growing ever, indoor, have a question about watering.

So, my plant it growing pretty quickly, we started it on Sunday in a cup and today the seed popped off and there are two little leaves! However, I don't know if I am watering it correctly. The stem and leaves are green but on the side in a little part it is looking a little yellow. I know that you're not suppose to water it too much because that can kill it, but I need to know exactly how much I should water it. Right now I have been going off the moistness of the soil. I have a spray bottle and I spray water on the top of the soil and I sprayed some on the new stem and leaves, but I also have 4 holes poked into the bottom of the cup, and I put water on a saucer and set it on that so that it can get water from the bottom. It soaks up the water within a half a day. Should I put more water on the plate when it empties? What are some tips that ya'll can give me?
Much Love,
Steph.

feed water every 2days or when the soil is dry u might need to repot it if its in a small cup i used a small pot bout 10cm deep and put that into a bowl and fed like that when the roots start coming out the bottom u need to re pot hope this help pics would be good though lol