Do both.
Go freelance (submit articles to whoever) while your still at your job, as getting a name for yourself or a foot in the door is the hardest part.
You've said you've submitted articles before and know some people in the trade so you are half way there already. You probably wont need training in journalism if you are already submitting stuff (I did a dip. in photo journlaism even though my spelling and gramer is shocking - is only a bit of paper)
Going freelance does two things, gives you a wide range of places to submit (if you choose to test the waters of different styles/fields) and gives you an exciting CV/Portfolio. plus the money can be more but I wont mention that 
Doing this while working does take up a lot of time but if you find journalism isnt for you, then you still have a pay packet.
These days its more who you know than what you know.
good luck
We childproofed our homes, but they are still getting in.
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