Need help stat maxing for the first time.

I've decided to go after the dark aeons and penance this go around. Something I've never attempted before. I have all characters with break hp limit armor. I need to know what specific monsters to fight in the arena to get all the spheres I need to clear and replace. I understand the concept, I'm overwhelmed knowing where to start so as not to completely screw myself. I highly need aid and advice in that area. Armors- wakka -super goalie(4 slot)- break hp, stoneproof -miracle comeback- auto regen, auto protect, auto Phoenix, stoneproof

tidus -genji sheld- auto regen, break hp, stoneproof -assault shield- auto regen, auto haste, auto protect, auto shell

Rikku -impervious- auto haste, stoneproof, ribbon, break hp -Marching Targe(4 slot)- auto haste, auto regen

yuna -arcane ring- auto regen, auto Phoenix, break hp, stoneproof

auron -Genji bracer(4 slot)- stoneproof, break hp

lulu -minerva bangle(4 slot)- break hp, stoneproof

Khimari - genji armlet(4 slot)- stoneproof, break hp