Hi Limith!

Since you played WoW PvP, you might transition well into FFXIV PvP. Some concepts such as burst, pressure, mana conservation (especially as healer), etc. apply in this game as well.

If you were a high tier WoW PvP'er, I suggest that after getting your feet wet in Frontlines, try Feast!

Also, AST is an excellent job to PvP with. Healers in this game have very high healing potencies vs. DPS. You probably already noticed that while playing Frontlines. As such, give AST a try!

If you need help with anything, there are discords and websites available. I highly recommend the Wolf Pup's Den discord and PvPaissa website. Anyway, hope you enjoy FFXIV PvP!