there should be a time line / dungeon chart

[MistakeNot]

I do wish there was a clear way in-game to know what order dungeons and quests are "supposed" to be done in. It's not really reasonable to ask newer players to pore over years' worth of patch notes to try to figure out the best order to do this sort of stuff in.

Just pick up and do quests/run dungeons as soon as they become available. This will, with very few exceptions, get things done in the "supposed" order. (Only exception I can think of is PotD which becomes available quite early.)