Which kind of attorney i need to help me to understand the rights i have in a prenup?

Hi, I have been living with my fiancee for a year and a half. We are planing to get married but he has properties and money, so he s making a prenup. I dont know anything about it, other than in case of divorce i get nothing, thats what he said. He also said, i need an attorney to represent me, so he will hire one for me, of course i dont know him either. I am a mexican citizen and really don't know about the rights and law in here. I do not want to sign something I dont even know, knowing that in the event we get divorced i will get nothing, which is kind of unfair cause i had go through so many things with him, including an abortion that i didnt totally agree with, but everything to probe i didnt care about his money. I will appreciate very much some advice, as im completely in white. T