I don't know if this got uploaded so I'm gonna do it again.
Do what ever you want, the cheats might be on or off, if you see a tall stack of glow stone go there , then open the trapdoor and babam.
P.S. you might want to get a lot of wood it is not far way, also you have one of each tool(pickaxe, axe, hoe, fishing pole, sword, and armour).
I also made a pre mine, there is a cave so watch out! :)