Thanks a lot, the article confirms that I'm some time away from a Dark Weapon.
Should I not bother with my Dark Weapon hex until then?
Should I keep upping Dex?
Should I focus on improving defence and agility just now?
1) As Stormtrooper said, don't bother using Dark Weapon with your fire-sword. The fire-sword WITH the Dark Weapon Buff does
three sorts of damage: Physical, Fire and Dark. That means that it has to go through
three separate defences. It's better to focus on one or two types of damage and push them as much as you can to get the most out of them.
Miss Trooper also mentioned the Silverblack Spear. This is an excellent weapon for a Hex/Melee build with a pretty cool moveset that you can get as early as Earthen Peak (drops from the guys with flannel faces and the shiny spears there). It naturally does both Dark and Physical damage, so Dark Weapon would be
extra brilliant here because it will pile extra Dark damage on (and very few people have Dark defence). I used it a lot early in my Hex/Melee build, so I recommend you go for that. It was even pretty good in PvP. When you get hold of a Darknight Stone and can imbue it, it'll buff the Spear's Dark damage even further.
2) Depends on the weapon requirements and whether they have good DEX scaling. If it's the former, just match the stat. If it's the latter and the DEX scaling is S, A or B, pump it to 30-40 (if you want to stick with it, that is). As Miss Trooper said (again), STR has better overall scaling, so if your weapon isn't has even or better STR, you'll get more bang for your buck from upping STR over DEX. It all depends on what weapon you want to use. If we take the Silverblack Spear, which has a C/C/C scaling in STR/DEX/DRK, you're better off upping your STR and INT/FTH (for extra Dark damage) rather than DEX.
3) Not sure. Depends on how well armoured you are, whether you use a shield and whether you dodge a lot. As a sorcerer, I'd probably pump a bit into ATN. That ups your spell casting speed, number of spell slots, number of casts and your agility. Get your agility (AGL) to 98-100 for now via ATN or ADP, I reckon. High AGL gives you extra I-frames, which are always handy.
One other thing: if rolling is your thing, then as well as a fairly decent AGL you'll want to keep your overall weight/encumbrance down, I find below 50% is pretty good (below 30% is probably the best). Low carry weight means you roll longer distances.
You could just get a decent shield though, depends what you are after.