How to create a “reverse blog”

Hello. When I wrote “reverse blog”, I wasn’t referring to the post order. Basically, what I would like to create is a blog in which visitors can see a post button (that directs them to register or log in if they haven’t already done so). I think this is going to involved allowing anyone to register as an author. I would also like visitors to be able to receive updates each time someone publishes or edits a post. Basically, this would be a forum, except (1) the number of comments on each topic could be limited to zero, and (2) visitors wouldn’t have to click on a topic title in order to see more material. Is there an easy way to do this – because I don’t know how to create new code? Thank you.