It's a pretty basic part of the build really. The gist of it is:
- Get yourself a fitting that'll fit your oil return lines and the big + little end sump seals for when you put your sump back on (not strictly necessary but worth doing as they're not expensive)
- Remove your sump
- Get a drill and drill out the right size hole for the fitting and its mountings
- Mount it up to the sump including a suitable washer
- Use 3-Bond sump seal or just whatever appropriate gasket goo you have to attach the end sump seals and put a nice bead of it around the sump edge
- Bolt it back up and torque it up in sequence according to your manual