question on questing

[Erigby]

my plan was to all along to do every single quest in the game. so my first class i took to 50 was a summoner doing JUST the main storyline, the next class i am doing is a level 30 blackmage.

i already got all the other classes up to at least 20. Now like this blackmage i was going to do just the quests in ul'dah and thanalan or the quests that start in those areas.

the other dps classes i would do in their respecting starting cities and surrounding areas.

kk my question is, i started picking up quests in Uldah at level 30, there are quests i can see that are red and not ready be picked up. Each time i level will i have to return to uldah to see if there are any quests to be picked up once i am of level as well from the surrounding areas?

the only reason i ask is because you have to move into the area to see available quests on that part of the map or is there another way? because i have quests that are level 38 43 and such far above my lvl 30 blm..did that happen becaus ei have one class at 50 already?