Heyyo,
At first it is a bit overwhelming, but then after getting it right, you realise how easy it is to setup.
Just create a folder called "addons" in your "cstrike" folder
create another folder inside your "addons" folder called "metamod"
inside that folder, create another folder called "dlls" and that's where you put your "metamod.dll" file.
We'll start out with just this for now. Just answer back once you get this part nailed down.