If you have a good soil to start, well fertilized by muck, you don't need to put any other fertilizer.
They grow either in fullsun and in mid-shadow.
The transplant is right when the plants have a pair of final leaves.
In this season at my latitude, they have to be wet, and so the quantity of water is function of rain and sun, they have to be neither dry nor muddy. You are the best judge of it.