Newish ARR player

[ExiledOne]

Do I really need to avoid a lot of the side quests, in case I play another class in that same area?

They don't need to be avoided but they're nice to have for your other classes. They're a nice source of gil while leveling.

I found them unnecessary for the most part while leveling but I would use them to top up when needed to progress to the next Main Scenario Quest. As far as gear they provide, the MSQ will offer you the same for your main class.

Playing as Tank in itself has a deep learning curve, there's a lot to be aware of in the dungeon. Targeting with a ps3 controller has its own challenges, but some do better than others with that, I suppose.