I've written an in depth instructable to help you survive your first day.At the time I wrote this,Minecraft is in Beta.I'll update the instructable if enough people want me to.
If you have a question,or a comment,please feel free to tell me down below in the comment section.That's what it's for,right?
NOTE:Updated for 1.8.Updates are in the last two steps.
Step 1: A description
So go ahead and click on one of the empty worlds.It'll randomly generate a world for you,and then we can begin.