Make yourself a road map of where you want to go with this story. Prioritize the events in your story. Once you determine what's most important, you'll be able to write more fluidly and cohesively. Don't get caught up in extraneous details. If you're feeling overwhelmed, just stick to your road map.
Also, the simpler the better. Learn to cut out extra phrases and words. Be direct. Don't over think it.