While playing the game press ` (next to 1 button) then a console will appear on the bottom left of your screen plus the game will pause.
God mode: tgm
All spells: psb
add gold and percific number: player.additem 0000000F xxx
^
That xxx is replaced with the amount of gold you want.
Enchantment menu: showenchantment
Spell creating menu: showspellmaking
Stop fighting: stopcombat
Customise race: showracemenu
Customise class: showclassmenu
Customise birthsign: showbirthsignmenu
Change gender: sexchange
Force Level up: advlevel
Force up Skill level e.g.: advskill blade 4
If you have found any other cheat for Oblivion you wish to share you can post here.