So I've played this game for a couple of years but have never touched PVP. Recently, though, I have wanted to try out frontlines, though I know there are a lot of important differences between PVE and PVP that I don't know about. I wanted to ask what those are and any other tips before I do go in.

I plan to mainly play AST (since my main healer, SCH, apparently has issues in PVP) and MCH in frontlines so any job specific tips for those would be nice as well. Thank you