But How do I get this 'Command Block?'

To Get a command block:
/give 'Player/@p/@a/@r' 'Item' 'Amount' 'Data' 'Datatag'
Complicated? Well not if you want a Command Block:
/give 'Player/@p/@a/@r' '137/minecraft:command_block'
Item is Command block and amount if you leave blank gives you 1
Amount: How much of that Item
Data: Like Wool has different Data's
35 is Wool
35:1 is Orange Wool the 1 goes into Data!
the Datatag you Don't Worry about it you don't need it for a Command Block...
Now there is your Commander Room! Full of Command Blocks!
Notice: Command Blocks are not found in the Creative Inventory.

First Command: Teleporting

Hey I am Play! Playmaster999 a Command Geek!
Minecraft is: Playmaster999
My other stuff is: Playmaster99

I Love Commands on Minecraft because I love making Maps and they are fun!
Commands at first are like... Wha???
But you Can Do amazing things Especially when 1.7 came out! This is my Point of View
of me playing this epic game! So lets get some simple commands
Command Blocks are Great! Item Id: 137
Item Name: minecraft:command_block
1. TP: Teleporting for Short.
You do Not use ' ' Commands yet these are just things saying what you input!
/tp 'Other Player'
This will teleport you to 'Other Player'
Command Block:
/tp 'Your Name/Other Player' 'Other Player/Your Name'
The First one is who is going to Teleport!
The Second one is who is the Destination!
Now Harder:
/tp '@p/@a/@r' '@p/@a/@r'
@p is Nearest Player to that Command, @a is All the Players, @r is Random player!
(@e will come in 1.8 don't say I missed it it is not out yet)
Good Luck with Teleporting!
I will Post one Command every Day!