Wherever you are in game it can be helpful to look up 'W101 [world] quest tree' (eg W101 mushoo quest tree) and find the guide. They will show you your main quest line and also help you decide which sides to pick up immediately - eg spell quests, training points, pets, crafting, gardening or fishing etc
It's great for seeing where you are and how many areas etc you still have to go in that world. It's also very helpful if you bump into someone you'd like to journey with because you can see quite easily where they are in comparison to you, even if their quest brought them back to an area you just started.
I often quest with the quest tree open in the background for reference