Organising posts in wordpress

[pokerextras]

I'm currently using the dealer theme, and want to use only two columns. At the moment i have the deal list then most recent posts in the left menu, and archives in the right menu.

If i get rid of the right menu, then visitors will only be able to access the most recent posts, and not any older ones.

I've organised the posts into categories, and only displayed the category menu, but when i click on a category it doesn't display it's sub pages anywhere.

How can i organise the site so i only have a category menu which displays a list of all of the posts under that category when i click it, and where will those pages be shown on site when the said category is clicked?