Hai there Hazwan,
In aswering your question " where should i go to become a pro badminton player, i mean
TO JOIN THE NATIONAL BADMINTON SQUAD"...one should go and make his way up through certain level/phase.
The road starts from representing your district first in a state level tournament. Here, if you play well, you will then be selected to represent your state in a Inter State / National level tournament. In this Inter State/National level tournament, if you play even better then you have a high chances to enter BJSS (Bukit Jalil Sports School). BJSS select their athletes via 3 methods which includes talent identification program, scouting and recommendation from National Sports Council / Association. By playing well at this high level tournament, there will be a high chances that you be spotted or recommend to enter BJSS.
Once in BJSS, the road to represent National squad will starts. Here, you need to excel well against your collegue at the National level tournament (MSSM, Sukma, National Junior Championship, State Open etc) to impress the National Junior Squad Trainee and selection committee that you have the what it takes to don the national shirt....and if you have it....... then you can start to join BAM as a Elite backup.
At this level, if you make our country proud by playing very well in National and International level (winning gold, satellite, Super series tournament........thrashing Lin Dan

, whacking LCW, toiling Chen Jin.....and also super thrashing Wong Choon Han. Hafiz, Arif, Liew Darren, or whoever there is still in our elite backup / main team where no good results being produce for decades........and also thrash fairurizuan for me also o.k

)..... i can't see that there is any logical reason for you not to represent the Elite Team @ National Squad! (...and if you do achieve this...please...please....motivate other national player to bring back the Thomas Cup too will you.................and again please thrash fairurizuan again during your training..)