Journalism

Hi Abbas,
The best way to start is to know what you are good at.
You could try to cast as many matches as possible, or be the most entertaining person on stream, but if you are not sure what your strengths are while doing a commentary, it would be preferred that you put in the effort to master one thing, than to do a lot more others at 50% capability.
There's a few requirements expected of the best commentators in the industry at the moment, be it as a 'color' commentator, or the one who is more of an analyst and strong in the technicality of the game itself.
You could start off with (not in order of priorities) :
Study / Research about the existing top casters in the industry and learn about their traits and strengths, and if any weaknesses
Learn a lot about your game, especially if you are new, and you aspire to be a pro commentator. A color commentator might seem to be less knowledgeable about the game compared to his analytical counterpart, but there is still a basic expectation of how much a commentator should know about his game. Jargons, technical languages, techniques, skills, etc.
Research on public speaking, as well as how speakers engage their audience in both a formal and informal setting
Learn about the different type of game commentary, which includes both sports and esports.
Learn how to pace yourself, pacing is one of the most important things in speaking in a proper manner that can be easily understood by others. Not too fast, but not too slow either. Try to keep any dead gaps short, and not too much 'uhhs'. It's alright to make a few mistakes at the start, but try to keep the number of times it happens at a minimal amount.
Try to learn vocalization if you can, where YouTube provides a lot of such videos on how to project your voice towards an audience, more than how you would see yourself casting with a microphone all the time. It helps you to deal with a transition from a home setup to a live event.
Practice in front of a mirror thousand of times until you don't get tongue-tied, and you feel that someone can finally understand what you say.
All the best.

Hi Lovepreet,
I have already answered a similar question for you.
BA in mass communication does not have any subject related to political science but a person having knowledge of political science will surely have an edge over other candidates pursuing the same program. If you aspire to become a journalism, especially a news reporter, anchor, or of any other profile in the print of TV industry, you knowledge of political science keeps you a step ahead of people fitting in the same profile. You will get to learn and read a lot of news papers, see television to understand the current political situations of the country and the world and with that, you can strengthen your knowledge of political science. I hope, it is clear.
All the best.

Hi Abbas,
Yes, it's almost like that. However, some people have very important role of luck combined with their talent to get a job as a News Anchor without becoming a News Reporter.
It's a pretty difficult job to get, but the path is somewhat straight forward:
1 - With a degree in Journalism; get a job as a reporter at a TV station in the middle of nowhere. Do anything and everything to get on air as much as possible.
2 - Compile a reel of all your best times on-air, submit this to TV stations at slightly less middle of nowhere markets.
3 - Once you have moved at least once, and find yourself in a place you could deal with living in for a while, and where the current on-air talent is old or weak, set to becoming an anchor for the local news, on any show, including the 5 am stuff. Make sure to kick ass when any real news happens.
All the best.