I'm messing up my blog's template.

And it's getting worse.. Please help!

I need the Blogger Classic Template: Minima White Lefty. I used to use the Minima White Lefty Stretch. I don't want it anymore. Then, I found this template I'm using right now somewhere, which is not the Minima White. That's why I don't like it either. Now, my blog is a total mess. I've been looking for Minima White codes on the internet but what I only get are those 3 column Minima White. All I need is the Classic Minima White, not stretch, and lefty.