Customizing tag archive page

I have a handful of questions regarding this.


Is it possible to make results appear in two columns?



And another issue pops up with the limited results are showing, depending on how many posts I've decided to show in homepage (I guess), and I would like to make them fewer and to list them on pages like 1,2,3 as for right now they show only in one page and doesn't say there is more.

EDIT
To answer my own questions, for possible future readers:

Numbered pages navigation bellow multiple post pages (like archives, blog homepage, etc) is called pagination and it is good to use plugin called WP pagenavi which can be then customized in ATO.

Regarding different number of posts displayed in different multi-post pages, there is another great plugin - cbnet Different Posts Per Page.