Dude if I was you I would do as much reading on this forum as possible do a search with your question and find the specific info you want. People document their whole grow from beginning to end. It is a great way to see what worked for people and what didn't. alot depends on your set up, hydro or soil, cfl or mh lights.
What i can recommend without knowing more is make sure they have lots of light and that you give them water, but not too much. Go real light on nuts at first, i don't use any for the first 2 weeks.
gl with your grow. read, read,read