currently have F visa and i want to invite my family here

Hi I am from philippines. Currently have F type. I want to invite my mother, father and son going here for a long stay like six months. May I have details of what exactly type we are going to apply? May I also have the detailed requirements or documentation needed please? Lastly, what is the best contact number who can speak english if we will process this for my family? Reply is highly appreciated, thanks.