What did woman have to do to become a nun the in the medieval ages/crusades?

Many women were placed into convents by their families. The Church received a dowry from the parents of the nuns, and any jewellery which belonged to the girl which added wealth to the convent or nunnery.  Many convents and nunneries only accepted postulents who were from wealthy backgrounds. Every candidate for admission  to a nun's order took the vow of obedience. The postulancy usually lasted one month, the novitiate one year, at the end which simple vows were taken. The solemn vows of the Medieval Nuns were taken four years later. Having once joined she remained a nun for the rest of her life. The medieval ceremony for the consecration of nuns was similar to a wedding - a nun would be seen as married to God. A ring was placed on the nun's finger and she wore a wedding crown or headdress.

Explanation:

The nuns in the medieval period were strictly disciplined.They dedicated their lives to the gods and had total faith on god.Even though the life of a nun was very hard women still choose to become a nun because it was a commitment for life.There are actually other reasons for women at that time to become a nurse  some became nurse to obey the wishes of their family and some became nuns to fully devote their life to god and live a secure life.