You'll actually have notes on this already - in your journal. You've got it on you somewhere, right? Everyone has one.

But to summarize, you've been brought to this world, and here to Isla Empieza, to search for pieces of a legendary ruby with unknown but ridiculous powers. We think its powers include "send us home", so we're looking for it anyway. This island is small, though, so you'll need to get a ship. You should have money on you somewhere, so you can either get a boat for yourself, or you can find other people and crew a ship together. Bigger ships are usually a better idea - if someone gets hurt or sick, you have people to cover for them. You can hold more stuff, too, and you won't go insane being by yourself.