Thanks all brothers and sisters for helping me clarify this matter.
I was worried that her family could ask a very high value as Mahr.

Dancing: Thanks, i'll surelly PM you as soon as i have another doubt conserning this matter :)
To negociate this marriage contract do i need a lawyer?

I'll be absent next hours but will reply as soon as i get back home, got papers to deal with concerning marriage

Only God Can Judge Me
الله فقط يمكنه محاكمتي

I am you and you are me, if you love i love, if you suffer i suffer
أنا أنت, و أنت أنا, إذا أحببت نفسك أحببت نفسي, إذا عانيتَ عانيتُ