My mind is a bit fuzzy. So please do not take this as pure exact knowledge.

How do you build each character stat wise, after you get espers. How do you level stat points into each character?

What type of job like build do you make each character into?

W hat I think I did last time

Terra build with magic stats and build into a caster
Celes Build with str make into a fighter
Sabin build with str hp, (except i forgot if you could build stats around his most powerfull blitz moves.
edger build with hp and just make him use white magic and tools as backup
shadow build with magic stats and stock up on many many scrolls
relm magic stats made like a caster
setzer build magic and mp for an excellent backup healer
gogo ???? ??? ????
mog str dex make as a fighter
locke str dex leaning more towards dex make into dual wield fighter with genji glove

feel free to give me advice, or comment on how you build your crew.