I am new here too, but I do not think of myself as a noob, just new to this particular forum.
If you have never made or even edited a movie, I would start with the windows movie maker if you have XP as it is the easiest to use, get familiar with putting clips together and cutting and adding music and so forth so on, until you get use to doing it, before you try using something advanced like Vegas.
As far as getting clips, it depends on what your wanting to do, a game or cartoon, movie etc, dvd's are prettty easy, games can be a bit more difficult to get footage off of, depending on the game. Alot of people download their clips off the web, that is not a bad idea for practice, and as mentioned read tutorials, they can be extremely helpful
