Visual Essay So Far..

I am struggling a little with this, I have a vague idea of what it should contain. I know my layout for my essay will be in web design, I have my 3 practitoners but am struggling to know what to include in it. I have no problem writing about it as in who I am using and why I am using them but expected to use at least 50 images and 3 videos & I don't really know how I am going to do this :(