http://www.ffxiah.com/forum/topic/25...age-any-advice
The rest of your questions have been asked many times in this thread, if a search doesn't work that would be very odd. Merits I would do would be:
CA recast 5/5
Phy potency 5/5
Weapons x2 str shamshir if no interest in pursuing Almace.
Atma, MM VV RR for spells as primary dmg if no CDC.
Spells would vary greatly depending on situation. Most common ones are the good DD spells such as QC, Gob rush, BT, heavy strike, delta thrust and common utility spells like animating wail, battery charge. Fill in other spells to gain traits like double attack and such. Vorpal is a very reliable WS as is sanguine blade (if target doesn't heavily resist).