As reported by Abou Hureyra (RA), our Prophet Mohamed (SAWS) said : "A woman is married for four things, i.e., her wealth, her family status, her beauty and her religion. So you should marry the religious woman (otherwise) you will be a losers." (al Boukhari et Mouslim)
The approval of your future bride and the contract signature can only be done in the presence of witnesses.
The dowry is provided to your future bride and should be proportional to your income level, in order to avoid any issues.