Enlist the help of the Elven Smiths of Eregion to forge seven rings for Dwarf-lords and nine rings for Kings of Men. These will be the rings that are subjugated to the power of your One Ring once it is complete. Be sure to observe the Smiths closely, as you will be borrowing their techniques when forging your Ruling Ring.
Go to Mordor and enter the Chambers of Fire in the cone of the volcano Orodruin, also known as Mount Doom.
Forge a simple, unadorned Ring of Power, using knowledge acquired from the Elven Smiths of Eregion.
Inscribe the One Ring with the sixth and seventh lines of the ring spell:
One Ring to rule them all, One Ring to find them.
One Ring to bring them all and in the darkness bind them.
Make the inscription using the Black Speech of Mordor, but write it in Elven script. The inscription should only appear when the ring is cast into fire.
Recite the entire ring spell, with credit to J.R.R. Tolkein, while placing the Ring of Power on your finger:
Three Rings for the Elven-kings under the sky,
Seven for the Dwarf-lords in their halls of stone,
Nine for Mortal Men doomed to die,
One for the Dark Lord on his dark throne,
In the land of Mordor where the shadows lie.
One Ring to rule them all, One Ring to find them,
One Ring to bring them all, and in the darkness bind them,
In the land of Mordor where the shadows lie.