well if you sub you get all the quests still and everything that you had before.

If you don't want to sub then you have to pay for quest packs zone by zone, and once you pay for a quest pack any of your characters can use it.

But buying quests and such is going to be a big part of the game.

No F2P game is really free. It is just a stupid moniker that should be dropped IMO. But if you do F2P, I believe this is the best way to do it. Giving the people who want to sub a choice as well.