How to make a blog?

I need to know how to make a blog so people can come and talk and also upload files jpegs would be fine. This is for an art class that I am in. We need to come up with some logos and it is hard for all of us to meet outside of class. If we could create a blog so we could talk and upload our files, it would be great. Is this hard to do? Have have HTML experience but I know this is beyon d HTML. I know there is probably some software that can do this for you but I rather learn how to do it myself. Please HELP!