How to import something from your iPhone onto your computer in iMovie?

I want to make a movie on my iPhone onto my computer so I can edit it but I don't know how

Sync the iPhone with iTunes.
Quit iTunes.
Launch iPhoto.
Locate the video in iPhoto.
Drag the video to the Mac's desktop.
Quit iPhoto.
Launch iMovie.
Drag the video from the desktop to iMovie's Library or Timeline.
Learn iMovie… Basics include Cut/Clip, adding transitions, adding titles and Sharing or exporting the finished project.

There's no "best file to export". The file you Share or Export for YouTube will be different from the file you Share or Export for your iPhone/iTunes will be different from the file you Share or Export to burn a DVD for playback on a regular DVD player…