the first reply said mostly everything

1. no waypoint system, my advice is use the quest tracker/ journal to locate the quest NPC's this will have a map option that shows you the general location of a quest or NPC on you map and mini map then just head in that direction!

2. same, after you are able to switch classes you can find each guild in one of the three starting area's or city states, (you wont be able to reach them until you unlock the quest that allows airship travel) so if you rolled a class in Limsa you can't access any gathering class until airship travel is available as both miner and botanist are located in Ul'dah and gridania.

3. I advise against spending money on a strategy guide tbh after level 50 you will realize that the beginning of the game from lvl 1 to 50 and main story is just one big strategy guide! its designed to teach you how to play and become comfortable with the class you choose to main!