1. shoot actively for a year, build up your photography knowledge and foundation
2. get to know some professional (people who work for money,not those self proclaim pro with loard of lens and body.), if possible, tag along for some jobs.
3. if you cant tag along any job, (depending on genre) you can pay to join shooting event, wedding workshop, model photoshoot, phototrip (local or oversea), local developer competition(interior/exterior structure genre) etc
4. those picture can be your starting portfolio, until you grab some Actual jobs and you can slowly build from there.
5. there is no limit in photography (but limit in manipulation aka photoshop) so go wild with mixing up the genre.
portfolio should be wide and specific. landscape is landscape. portrait is portrait. if landscape portrait, then name it landscape portrait.
OR, you like to play life in HARDCORE mode...
1. keep shooting, dont excessive watermark, keep sharing... keep doing repeat repeat repeat.
2. the moment your pic get leaks around or went viral around, you know you are GOOD enough

and people will come to you automatically. this time, you can charge whatever u like and people still pays.