Also i downloaded OOO already how do i install that or a link to a 'for dummies guide' would be nice.
Easiest would be to use OBMM for the install, as OOO 1.33 Complete comes in an OMOD-ready variant and the 1.34 Beta 5 patch is easy to make an OMOD of as well. So in this case: download OBMM, get the hang of it, use the OMOD-ready version of 1.33, create an OMOD of it (basically Create > Add archive > navigate to 1.33 OMOD-ready > say yes > wait a long while).
It's safest to install huge mods (with lots of textures/meshes etc.) either via OBMM or Wrye Bash's installer, so it's a good idea to learn the basics of OBMM anyway. Alternatively, you can use Wrye Bash's installer (BAIN) instead. It's gives better control over the install than OBMM, but is perhaps not as easy to get started with. (That said, installing OOO 1.33 via BAIN is for most users as easy as installing directly from the archive.)
EDIT: In fact, thinking of it, it's easier to install via BAIN. And it's perhaps as good as any other mods to get started. With BAIN: install Wrye Bash, get the hang of it, open the Installer, highlight/right-click on OOO_133_Complete.7z (which should be in Bethesda Softworks\Oblivion Mods\Bash Installers) > install > wait a while.