Picking the right professions for a character is always a bit of a puzzle, or at least it is for me. Do I want to make gold in the short term with a pair of gathering professions or do I want to craft gear for myself that will be useful as I level -- and maybe even at end game? If I pick up a profession now, who's to say it will still be what I want after I've leveled up? And do I even want the hassle of leveling up professions? And, even if I do want to go to the trouble for primary professions, what about secondary professions? Do I really want to level up fishing again?
Of course, I inevitably come to the conclusion that leveling the professions as I level up is easier than leveling them later, but my profession choice is always pretty haphazard. (Except for fishing. I have leveled fishing enough for a lifetime.) Though there are, surely, better ways to pick professions, my selection inevitably boils down to what sounds good to me at moment I hit level 5, regardless of what may be good further down the line.
But surely you, dear readers, have better sense than I. How do you go about picking the right professions for a new character?