No matter if you are applying for a job in the real life or through Internet, one point that everyone is going to agree is that cover letters matter as much as a good cv.
If you are applying for non-technical job post, your potential contractor is likely to receive a lot of applications. Lots of them. The easier the task is to accomplish, the higher the number of applicants is going to be.
You need to be catchy/interesting enough to make your potential contractor open your application. You can stand out your application by following these steps.