yes make it a bit smaller trow all unnessesary moviesetups away so keep the action instead watching some movie-sreens were nothing happend keep the timer on 3/6 min.
You tube will format your movie to there size, so its importaint to get it sharp enough for release.
To make your movie sharp watch for those settings i think you have to have it SHARPNESS :)
I use MAGIX its easy in use also for not skilled moviemakers BUT, there is almost no limmit in it to make it beter then your last release :)
If you cant get it sharp PM me and i can help you out with it ;)