Hi there.
There is no limit to the space that your website can use. You can have as many pages/images/files as you wish.
However, these is a 50mb limit on each individual file.
So if you want to include videos on your website then I recommend that you upload them to YouTube/Vimeo/similar then embed the video on your page. You can do this easily using the YouTube or Vimeo includelets, or directly adding the "embed" code from them into the HTML of a page. There's an example of video embedding here.
Thanks
Joe - Voice Admin