Given your source material, you're honestly better off not using the familiar DAW work flow.
Instead, open each clip in the Source Monitor, find the stuff you want to keep and add those sections to a sequence. When you're done, you can give that PP project to your brother. He can import that sequence into his current project and have all the good sections to choose from at his fingertips.
This has several advantages. First, no reencoding of already heavily compressed media, each phase of which reduces quality. Second, no exporting, which saves time. Third, no exporting, which saves hard disk space.
(By the way, YouTube is fully capable of genuine 1080p.)