Some examples that can be included in the request message:
* Ideas for the project in which you could contribute, detail the idea of what you could help to incorporate.
* In case of being a Programmer, explain the programming languages in which you feel comfortable to work.
* In case of being a Graphic designer or Sound engineer, provide a portfolio with a sample of your work done.
At the time of sending the application, it is advisable to detail as much as possible about yourself, country, age, languages you speak, skills, time availability, ideas or suggestions you might have and any knowledge you think could be helpful for the project.