Step 1: Download required files
Here are links to the respective download pages:
OBSE version 16 (newest as of this writing) (1.5 Mb)
Oblivion Reborn version 0.6.10 (alpha) (157 kb)
If you do not have Oblivion version 1.2.0416, you can get it from the Official Elder Scrolls site here:
English Version (5.1Mb)
Other Languages See this page for patches in your language.
The rest of this instructable assumes that you are patched to version 1.2.0416.
Optionally, you may also download OR:Complete, a tool that helps you identify problems, configure OR, and check server status. You will find it here:
Oblivion Reborn: Complete (15 kb)