DJ, the short answer is that you need to capture the video from the game, either live, or from a replay with capture software like FRAPS, then edit it with movie making software like the free Windows Movie Maker. Add music, transitions, and titles with Movie Maker. Then upload to YouTube.com or Vimeo.com.
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PC: Windows 7 Ultimate 64 / Antec 900 / Corsair 750W / MSI X58RO-E
Intel i7-930 / 6GB DDR3 1600 / MSI HD5770x2 / CH / G27
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Console: PS3 / Samsung 61" DLP / Playseat / DFGT