How to get a divorce when wife cant been found?

its only been 4 weeks but no one cant get in contact with her via text and email or phone calls we have 2 kids. and they are with me right now in nj but we are from ny she has no family in ny anymore. i seen on her twitter she said she is disappearing so i guess she dont want to be my wife or mother to her two children anymore i want a divorce and to keep my two kids what can i do. i dont have money to hire anyone what can i do ?