M: After getting the wooden sword, head west from Hyrule Castle. You should be able to uncover a warp to the Dark World. From there, go further west until you can go no further, then go one screen north. You'll find another warp that will take you back to Hyrule. Go north one screen and you'll arrive at the Western Temple. Now this isn't Level 1. Level 1 is after Western Temple. After beating Western Temple, head back to your house and go two screens south of there. You will come across a raft shop, although the guy will give you the raft for free. One screen left of the shop is a dock, which leads to an Island. I think you will be able to find Level 1 from there, since the Island is pretty small. Just watch out for the sharp grass!
Nanni: First off, look in East Oracle Mountain. Head into the cave west of Level 4 and use your Lens of Truth on the right wall. It should indicate a secret passage. Walk through the wall, and you should find a Goriya who warns you not to step into the warp ahead. Do so anyway, since he doesn't know you have the ability to warp out of there.
Anyway, You'll find yourself back in the Dark World, but in a secluded area. Level 6 will be the warp tile guarded by the Magic Octorok. Also, this area is pretty small, so it will be hard to get lost. Don't forget to stock up at the shop there, before trekking into Level 6. Things can get a little crazy in there.
