simple short version of writing a melody

Steps
Get some lyrics. You will need lyrics for this method of writing a melody.
Think of how you want your song to sound. Is it a fast, frantic song? A slow, sad song? Having a basic idea of how you want the song to sound is crucial in writing the melody.
Each syllable is worth one note. If you listen to a song, you will realize that the singer changes the note on each syllable. Take your lyrics, and look at the first syllable. If you play an instrument like guitar or piano, play a note while looking at that syllable. How does it sound? If you like the way it sounds, write the note above the syllable. Keep doing this.
Once you are done, play the whole piece on guitar or piano. Then, sing what you heard on the guitar. If you are satisfied, you just wrote the melody! If not, find what you don't like in the song and try doing something else.


credit to: http://www.wikihow.com/Write-a-Melody