1. when you germinate and then place into soil make shure the root is down but don't bury it to deep just enough to were the seed is slightly out and lightly water
2.supporting the plant is good but being that young you could transplant up to the leafs probly be better
3. the leafs are down at night because there is no light for the leafs to stretch and capture but if the are drooping in mid day then check the soil to see if they need to be watered
4. I know you didn't have a fourth question but this is a suggestion
if you are using nutients this early you will burn them plants really don't need anything but water until 3 to 4 weeks and I suggest reading the cannabis grow bible

but I have a question of my own

!. what seed company did you go through 20 free seeds sounds like a dream