I'm a n00b demo levelling general & havok, and things seem pretty self-explanatory on that side.
What I can't get my head around, however, is the crafting system. Coming as I do from DDO (no crafting) & then LOTRO (excellent & intuitive crafting), I can't make head nor tail of the crafting system in AOC.
I don't think that I know the ultimate answer.
I took armorsmithing and gem cutting to craft armor and gems for me,
but regarding my consume of health pots, perhaps alchimist had been
the better choice.
As far as I know, you cannot craft staves, so weaponsmith might be
no good choice.
As for architecture, I think a few per guild are enough.
To me it seems there are no crafts especially fitting to any class,
but perhaps weaponsmithing for melees and rangers.