The most complicated thing about red mage is just knowing when to corps-a-corps in and make sure you don't displacement off a cliff. Otherwise, it's just jolt > Veraero/thunder > Jolt or Verstone/fire(if proc'd) > Veraero/thunder > repeat and then melee combo whenever you get the gauge for it.

It's an easy dps because of simple and basic it is. No fancy bells and whistles to worry about like a lot of other jobs.