I've been in your shoes. When I first heard of string quilting it didn't make sense to me. That's why I had to learn about it too.
There are several ways to do it. One of the most talked about patterns for string quilting works off of the middle of the square block. This creates the only uniform look to the whole quilt.
You can find more information by doing a search for string quilting. I suggest using Bing. It comes back with better results than Google.