So I've decided to play FFT for the first time....

[nfitc1]

I've had FFT:WotL for a while, but only recently decided to start my first game. I don't know much about it or the battle system. Can any one offer tips/clue me into missable things/tell me the best farming locations and classes/etc?

[sl1982]

Best way to gain jobs is to have whatever job you wish as your main and squire as the backup. Then just keep throwing stones at everyone.

[xLostWingx]

You can gain experience and job points by targeting your own characters also.  Send some characters out to fight the battle, and keep a few in a corner to beat the crap out of, and then subsequently, heal one another.  I particularly enjoyed gang beating Algus and Delita early in the game.

[royalmurder]

Ahaa I do enjoy beating on the useless guests....

also, if you get the Focus ability for Squires, it increases your physical attack by +1 (regrettably, all changes are reset after battle...) and the animation doesn't take very long.
once you have JP Boost (also Squire:- I strongly recommend getting this ability asap) then it makes things a bit faster.
with regards to missable items though... the only one I can think of is the Tynar Rouge, but that's quite late-game. Look on GameFAQs if you want to learn how to get it, I can't remember.

My advice though; always have a healer
There is nothing more annoying than a character dying once you get them to the jobs you wanted