How do I add a new column?

[Jennifer2010]

Hi Guys,

I'm trying to accomplish three things:

1) Underneath each title in the forum threads display, it has a "started by: (username) (date)" - I want to remove this so the only thing being shown is the title of the thread
2) I want to create a new column to replace the status icons to the left of the title, instead of being the status icon, just the username who started the thread (essentially moving the "started by" reference from under the thread title into it's own column)
3) Remove the thread rating/rss/attachment icon column

What template(s) are these located in?

Thanks so much!