I went to do some quests and some of the people are locked because I haven't discovered Omen Island or something, and apparently I need a map to get there? How do I go about getting map pieces(?) ? Thanks in advance ^_^

You'll need to collect the uncharted land map pieces. [Item=Uncharted Land Map Piece 1] Pieces 1 through 9.

Once collected and in your inventory, in the Games Room, go to Treasure Maps > Omen Islands, and put together the map.

Thank you so much for a very detailed response, I really appreciate it ^_^ I hope you have a wonderful day C: