Before question let you all know my SPECS of desktop
AMD Phenom II X2 555(3.2GHz)
Kingston DDR3 1333MHz 2GB
WD HDD 1TB
Sapphire ATI RADEON HD5670 1GB DDR5
MOBO MSI 785G-E53
PSU C/M Extreme 460W

Question
1.What is adjust CPU FSB frequency ? (Meaning adjust Front Side Bus speed )
2.What is adjust CPU ratio ? (Adjust CPU GHz speed ?)
3.What is adjust CPU-NB frequency (Meanig North Bridge ?)
4.What is Memory-Z
5.What is FSB/DRAM Ratio (Adjust RAM MHz or RAM and NB between FSB ?)
6.How to OC desktop to stabilize and will not Hang or other problem like restart or shut down thing ?
7.Want to ask why at BIOS and Windows 7 see my Processor is 3.2GHz.But check at CPU-Z core speed there only got 800MHz. Are this MOBO BIOS problem disturb, meaning that AMD Cool'n'Quiet ? I never set it before just let it default. Or my MOBO or processor got problem ?

Sorry,my question like self ask self answer. =.=" (I just a newbie for OC)

Help me pls.
Thank You.