I want a forum just like this forum

I have been working this issue for hours and I just don't get it.

I would like a very visually simple forum just like this.

I would like to be able to post announcements to the right sidebar

i would like to have a very basic editor at the bottom ()just like this)

i do not want the bottom topic tag website url or checkboxes

my objective is to allow people to enter (and "post") their "thoughts and have announcements of events on the right sidebar

I am familiar with both cf7 and bbPress. I just can't do it on my own :-(