No one website per say. I used a program called "a tube catcher" which is free and has a really nice screen capture program that doesn't limit quality for resolution size. The rest I just used Windows Movie Maker to put the recording into the format I had.
The best advice is an old one. Paint the dog before the flees. Block in everything first, then start to control the color and atmosphere, then start shaping it like clay, and then you slowly fill in large detail to small.
These speed paints do loosen you up and in fact I just completed a full illustration that started out as a speed paint.