Best to post your questions in your own thread. But since protocol isn't really a primary concern around here I'll answer anyway.

You can flip your plants to flower whenever you want once they are no longer seedlings (after week 1 - 2 strain dependent). The plant will start alternating nodes once it reaches maturity between weeks 3 - 6 (again, strain dependent). I don't recommend flipping in and out of flower although some do this to determine plant gender. Flipping back and forth between flower and veg will stress the plant and can cause hermies in plants that have weak genetics.