To become a marine Biologist, you should focus on studying a combination of Biology, marine science, and related disciplines. Here are some steps you can take.

• Start by pursuing a bachelor's degree in the marine Biology, marine science, biology, zoology,  or a related field.
• Gain experience by seeking internships, volunteer opportunities, or a part time jobs in marine biology related fields. This will help you gain practical experience.
• As you progress in your studies, consider specializing in a specific area within microbiology,  such as marine ecology, marine microbiology, marine genetics etc.
• Depending upon your career goals, you may choose PhD in marine biology or related fields. As it can open up opportunities for research, teaching or private industry etc.
• Build relationships with professionals in the field by attending conferences, joining professional organizations.
• Keep up with the latest research, trends, and developments in marine biology by reading scientific journals, attending seminars and workshops.
• Develop strong analytical, critical thinking and problem solving skills, as well as proficiency in data analysis and scientific writing.

Marine biology is a broad and interdisciplinary field, so it's essential to explore different areas of interests and gain diverse experience throughout your academic and professional journey.