Before you go into a fight you want to cast any beneficial spells on your party that could help with the fight, this includes protect but some spells aren't very useful, such as sleep ffxi gil protection when fighting a monster who doesn't cast sleep.
In combat, if you want to hit the enemy with your debuff spells, such as Paralyze and Dia are two effective spells at low levels. Many people will say that paralyze isn't worth casting by reason that they have never seen paralyze in action because it is a very helpful spell. US WOW Gold What it does is gives the enemy a chance to be unable to move each time it attacks for the duration of the spell. So if you cast paralyze on an enemy and it lasts for 30 seconds, every time the creature attacks for the next 30 seconds there will be a chance that it will fail the attack and instead be held immobile.
Since mana regenerates faster than health, after the battle is over the white mage will want to use any remaining mana it has to heal the party and then /heal to regain all it's mana. White mages are the most ffxi gil sought after job for groups in this game. If you don't want to have to spend a lot of time looking for groups and being rejected, a white mage is a good choice.
The Warrior has a fairly simple job, and one that can easily decide the course of the battle. The job is to use the Provoke ability. The most effective way to do this is to write a macro and put it in an easy to use macro slot. What provoke does is makes the target more interested in attacking the Warrior instead of its current target. As usual creatures will go for healers and high damage dealers first but those two can usually take very little damage compared to a Warrior.
If there are two Warriors in the party, it is best to organize with each other ffxi gil when to provoke, which ahs a 30 second reuse time. There is no point in both Warriors provoking at the same time, so it's best if you take turns. One way is to just take turns provoking every 15 seconds. The other method is to only provoke when the creature starts attacking something other than the Warrior, and just take turns doing pulling it off.