green card for spouse's child

Hello. I am gonna apply a green card for my wife. My currently is a green card holder. I also apply for a citizenship. I will become a citizen in about 4 to 5 months. My question is: should I turn in I 130 as a permanent residence now, and then I inform USCIS after I become the US citizens to...

A us citizen wants to apply a green card for a wife who is already in the States and her 16 years old child who doesn't live in the States. Her child also has B2 visa. Should she come to the States and apply for a green card here? or if apply green card while she lives outside the States, can...