The combination of an MBA and your language and computer skills should stand you in good stead in the field of management consulting, especially in a firm that is international in scope. Both contain industry profiles, job listings, career profiles, and other advice for job seekers in a variety of fields. Often fellow alumni can be excellent contacts and would be happy to talk with you and provide advice and job leads. It is often helpful for job seekers to join a professional organization in the field that they are interested in entering. It is even more useful to become active in the professional organization, so that you really get to know people in your field.
Professional associations sponsor educational programs and networking events.
They also often publish newsletters and job listings. As you embark on your job search, think about what makes you unique. In your case, it is your language skills. Leverage that experience by seeking work with companies that do business in Latin America or Spain, or by talking to Latin American firms doing business here. A drunken driving conviction is not a felony, and I encourage you to try to find a way to forgive yourself for your youthful indiscretion.