The oath that is obligatory to fulfil is the one which is preceded by the permission of the father. If the son made the oath without informing his father or getting his permission, it is not obligatory to fulfil it.
The woman can say: "I marry myself to you on a dower of so-and-so and for the duration of so-and-so." and mention the amount of dower and the duration of marriage and then the man accepts by saying: "I accept". He can start the contract by saying: "I marry you on a dower of so-and-so and for the duration of so-and-so" the woman then accepts by saying: "I accept". This can be in any language.