First of all, you should evaluate yourself whether you really want to become a photojournalist or not. Do you have a passion to excel in this field or not because this is very important for reaching at the top in any field.
After making a firm determination for becoming a photojournalist you need to take relevant qualification. You should take classes and get training from a journalism or photography school.
During the classes and training at school, you should try to improve your skills and techniques along with the in-depth knowledge of photographic journalism. It will help you to gain required knowledge and skills for getting a deserved place in the field.
After completing your training at a journalism or photography school, you should purchase a high-end digital camera from the renowned companies like Canon or Nikon. Make sure you have completed the gear along with different lenses that will be used with your digital camera.
You should apply for an internship as a photojournalist in a local newspaper or magazine which will help you to get field experience. Most people start as internees but work hard and earn the position of a full-time employee newspapers and magazines.
Make sure you keep a track record of your performance which is also known as portfolio. Your portfolio will help you in getting the position as a photojournalist in some renowned news media.
Keep developing your skills during your internship and learn the usage of technology used in photography like scanning, printing, editing and downloading of images and a proficient understanding of Adobe Photoshop. It will help you to become a competent photojournalist.
Work hard during your internship which will not only help you in enhancing your skills but will also grab the attention of your employers and you will stand a good chance to earn a full-time position.
Photojournalists always face physical challenges as well because they sometimes spend hours in holding their cameras to cover some event. So, be mentally and physically prepared to take the challenge.