Custom Wordpress Template

I want a very simple dark blue heading (white background) custom two column right side bar Wordpress template like mashable.com. I'm not familiar with Wordpress so if I'm stating the obvious please forgive my ignorance. The top will have a location for a logo and a banner. A row of buttons on top with capabilities of adding drop downs in the boxes. Last but not least the right side bar column must be able to stack same size plug-ins and widgets. A bar at the bottom is also a must. I know I'm probably stating the obvious for you Wordpress experts.