Looks like you've already answered that question.
Seriously - I'd recommend a book or few and plenty of surfing just to get a general overview, but you can mix it in with forum participation. There's no real rule on that sort of thing.
But why post if you don't have Linux yet? Maybe you won't have any problems at all. *tries to keep a straight face*
No, seriously - always check your man pages, info pages, do web searches, then ask questions. It isn't like you have to read everything in the universe before you can post constantly or like you should dive in posting things you could easily answer for yourself and then read everything later.
Encounter problem; do research; solve. Or encounter problem; do research; fail; come ask for help; get help; solve.