What' do you mean by a long column? There is only ONE dynamic page in a blog for posts and we cannot post to more than that one page. When we publish a post it automatically appears on the running page for posts and also on the Categories pages and Archives pages.
We organize our posts by assigning Categories to them. Although there is only one dynamic page in a blog for posts and we cannot post to more than that one page, we can create the appearance we have done so by creating a custom menu. In that custom menu you will be displaying Categories in tabs along the horizontal navigation to achieve what you want.
These are the how-to instructions:
1. You create a custom menu. http://en.support.wordpress.com/menus/
2. You add the Categories you want to display and arrange them in the order you want.
3. Then you add and drop and drag the sub-categories below the appropriate Categories, and when you have everything arranged in the menu that you want you save the menu.
4. Go to the “theme location” module at upper left on the menu page. Select your custom menu name from the pull-down labeled “primary location.” Click the save button in that module.
Note: If you wish you can also include pages and sub-pages of your own choice and custom links in your custom menu as well.
P.S. I have working at home on contract work and multitasking by answering support forum questions. I witnessed that you had videos but I did not watch them. I did not have time to watch and to be frank videos of that nature do not appeal to me. =)