how to make this very simple theme

I was wondering if it is possible and how to make a very simple theme for a wordpress where there is one sidebar on the left that starts at the far left(no space between the browser’s left edge and the side bar), a header that is solid colored that runs along the whole top(that has the post’s name displayed on it in “<h1>”) and the content is just under the header and on the right of the side bar and it stretches through the rest of the page.

sorry if that description is bad. As is obvious, I am a complete newb