I wrote this song based on the song Celebrity Status by Marianas Trench.
Think of many things about songs you have listened to and have enjoyed and take bits and pieces of parts you liked in the song and create your own beats and rhythms. (this will help big time!!!)
A topic and a certain beat with a rythem will go great with a taking bits and pieces of ideas from a song and turning it into something intierley different(after these steps, you'll be an excellent song writer!!! LOL)
Remember these are only beginning steps to becoming an awesome song writer.