I'm not on your server, so I'm not sure how good a mentor I would be...>_>

However, if you're not digging on the DPS and want to heal, there are 2 routes you can take. Both of which will require arcanist and conjurer.

First, there's scholars (ACN 30, CNJ 15): They are healers, but they don't have the healing power of the white mage. They are great for damage mitigation. It is possible to be a primary healer as a scholar. I've done it as scholar is my primary job.

Secondly, you have white mages (ACN 15, CNJ 30): They are healing powerhouses. They have the bigger healing spells, and more powerful AOE's. They also get things like stoneskin and protect. White magi are generally the primary healer.

It really depends which one you feel meets your needs. If you want, you could have both. I do. They handle differently and each have their drawbacks and perks. It just depends on which one speaks to you more.