V101/Heavenly Battle are a must, +40% Attack Speed bonus, since you are a hucast and are still new, you have a nice stats mag, get a Heavenly Arms(+25 ATA) to help your ATA and you can hit most enemies and get some exp when playing with other people, the other 2 slots could be Heavenly Power(+55 ATP) or another Heavenly Arms depending on how you feel your hucast is performing while playing with other people, i'd recommend you max ATA asap though, try some crazy things with your hucast that way you can get the hang of the enemies and get a style that suits you more, although hucast is the most powerful character in the game.
For a shield Kasami Bracer shouldn't be too hard to get, although i don't remember exactly where you can get one, i think in one of the black paper deal quests not sure, but avoid getting hit should be one of your priorities, most enemies have a pattern try to learn it to dodge their attacks.
Avoid soloing! Ultima has modified stats for characters (no growths modifications unfortunately) and monsters, so things can get quite tough when you are just starting in here, try joining people close to your level, as for swords, red sword is ok for the meantime, freeze traps are your best friends, iirc hucast gains 1 Freeze trap per 7 levels, so using freeze traps and red sword can make it up for the low ATA, probably you are still gonna do a NNH or NHH combos with red sword but still.
A lvl 120 hucast should have the next stats: 972 HP, 746 ATP and 135 ATA, so your mag should boost your ATP to 1030, with a Heavenly Power you'll have 1085, and ATA to 161, get a couple of Heavenly Arms and it should max, hucast's max ATA is 201, so you will miss alot less, PSO is an offensive based game, so tanking is not a good option really, you should get a material plan or at least get an idea of how your hucast is gonna be at lvl 200, so you give him a few pow mats to boost that ATP.