Yeah. Lately I've found that I have a lot of IDEAS for writing, but I just don't know where to start when executing them.
I would really like to write a novel one day, but I write in this weird lumpy incoherent way. I need to force myself into it.
Why would you want to copy his style?
The best recommendation I would give is just to write. John Green didn't just sit around on his butt until the entire plot of Paper Towns smacked him in the face. He wrote a bunch of it, edited it, and then had someone edit it again several times for him. During those edits the plot began to form itself, the original draft was probably way different so don't worry too much about it.