You can either change the xml to give yourself 3 columns, or download a template.
At first, I did it myself. But I screwed it up somewhere and everything I put on the left hand side, it mirrored to the right. And vice versa. So I ended up downloading a new 3 column template. You just need to google "free blogger template 3 column." make sure you specify blogger, or you'll get a bunch of wordpress ones, and they won't work. I ended up with Minima so I could customize it more easily, but I might change it again. I want it to be unique, and there are lots and lots of blogs using the 3 column minima. I don't know yet. I might just say screw it and leave it the way it is, for a couple months anyway.
To backup your widgets:
First, go to dashboard-->layout-->edit html. Now click the little box that says "expand widget templates."
Now C&P your code into a new document (notepad, wordpad, whatever.)
Now, on that same page, you will see a place to download your template. DO that. I called mine template1219, with 1219 being the date. THIS IS IMPORTANT. Because that way you can try on a bunch of new templates and if you hate all of them, you can just go back to the original.
You will notice that I essentially backed it up twice. That is because I am a complete idiot and am sure to screw it up somewhere. If I could have, I'd have backed it up ten more times, seriously.
Now here is how I saved my widgets without sifting through code.
go to dashboard-->laout-->arrange page elements.
also open up a new document. I used word for this.
also get a piece of paper and a pen.
Now, on your paper, write the number 1 and a brief description. Mine said "1 HTML - no copy."
Now on your c&p that code into your document with header of "1 html"
next I had followers, which I don't need to edit, code wise. So on the paper I wrote "2 followers."
I did not do anything for 2 in the document.
next was a text box. On the paper I wrote "3 text."
on the document i typed "3 text" and then c&pd the contents of that text box.
and so on and so forth. Mine is nowhere near done, and a lot of junk is sitting at the bottom of my page because I haven't decided where to put it all. But it has to be somewhere on the page in order to maintain membership at all the different blog directories.
I also had things embedded into each post that I need to deal with. Those bits of code are still buried somewhere in those 25 pages of xml code. No one used them anyway, but it made me look official. Always good to look official, then people might think you know what the heck you're doing.