1) engage detective agency and do back ground check on the girl
2) ask for the girl bio data
3) it should contain detailed particulars of girl her educational qualifications , her age , work experience etc
4) also obtain in writing that no dowry demands were made before or at time of marriage
5) you are at liberty to call off engagement if boy and girl are not compatible
6) if girl files case of dowry harassment apply for and obtain AB from sessions court