It's so easy to cast or melee with a FOmar, it's not funny.
With 1002 ATP, and level 30 S/Z, you could beat any stage with a Game Magazine (Assuming this is offline single player, and no, the ATA is not a problem even in CCA/Seabed). So basically, anything, although you'll probably want some good weapons
So, my general thoughts to a characters equipment (I probably stole this from someone, or adapted to it unintentionally, so yeah), one single targetting multi-hit, one multi targetting, one range.
Twin Chakram/SRank Twin, SRank JCutter/Red Slicer, Red Handgun/Bringer's Rifle/Holy Ray.
As far as mag is concerned, mostly power, a little bit of dex (Don't go overboard), and put in God/Arm to make up for whatever dex you may be missing (You don't need maxxed ATA to hit well in CCA even online, but it'll help)
And casting is just easy, so most people will tell you to use technique boosting wands and merges, but those are totally unnecessary. All you need is a High Mind mag. Use a shield that raises your Defense, and you can use /Mind units or /Cure units, but I like my Casting Forces slots, 4 God/HP.