Actually, maybe you can help me out first, and maybe youself too, by answering this question: why do you want to start a career as a Business Analyst? What do yout think the job is? I ask because many of us in the discipline, and many employers too, have different definitions of what a Business Analyst is or does.
In parallel, are you in Marketing now? or something else? Why would you want to stop doing what you do now?