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.
Step 2: Punching trees
The first thing you want to do is find some trees to harvest some wood.I can't tell you where to look,because like I said before,every world is different.They're pretty common,though,you won't have much trouble finding them.
Once you've found a tree,point your blocky hand at it and hold down your left mouse click.After a few seconds,a tiny tree block will pop out and the tree block will disappear.You should pick it up automatically.
You want to collect at least 16 of these.
Step 3: Refining
Hit the " e" key on your keyboard to bring up your inventory.Drag the wood anywhere into the 2x2 square of boxes in the top right.A different type of block will pop up in the 1x1 table,with the number 4 beside it.That means that one wood block will give you 4 refined wood(planks).
Keep clicking the planks until you have 32 planks.That's all you'll need for now.Keep the rest of your unrefined wood,you'll need it later on.Hit " e " again to exit your inventory