Final Fantasy Hacktics

Hello all, just recently got this game and haven't played it in... at least 15 years. Can someone explain how I can efficiently level each class to get to the end goal of having the below characters? I've researched a bit and these look fun, but I don't want to waste time off the bat leveling my characters the wrong way for the below.

Main (Assasin) unless there's a reason he shouldn't be. Elementalist Ninja Juggler Red mage Time mage (or whatever the best healing build would be for a nu-moi?)

Any help or advice on how to build this team from the start would be super helpful!

Thanks!