Can you go to Oklahoma Baptist University and become a lawyer?
Yes. Oklahoma Baptist has a pre-law then you have to go to grad school.
In order to become an investment fraud lawyer you need to become a lawyer who then specialises on the said field. In order to work as a lawyer you generally need a university degree in law and - depending on which country you chose to work in - possibly also acceptance into the bar association or a similar guild-like structure of advocates.