Yes, it should make use of your internet connection regardless of the provider. As far as desktops that are similar to Windows, Gnome and KDE are the most similar to Windows but even they have differences so it will be up to you to figure out which you are most comfortable with. Both are available during the installation process of many of the more popular distributions, should you choose to install one of them. I know, as a new user, the command line may seem difficult and intimidating at first but it will help you in your learning process if you get to know it. All Linux distributions are based on the Linux kernel and the best way to learn that is to use the command shell so even though many distributions will try to abstract those details into easy-to-use GUI interfaces, you will have an easier time learning Linux if you got to know bash and the command prompt.
Will it work with my Comcast high speed?
Is there a desktop like windows? (I dont want to do all command line)