By Letter of motivation, Writing tips

Hey guys!I'm a new registered member of the site, but an old-time visitor. I've acquired numerous valuable ideas and tips here, which helped me a lot to write the following motivation letter. If anyone could give me further advises on how to make it better, that would be real great....

Hey all! I am applying for a (English) study in a Dutch University. Anyhow, they ask me to write a letter of motivation...I did it before, but still it feels like it's the very first time because I really dont know where to start!!Everything I write down sounds very stupid!! Can you give me...