Music idea...First Rhythm

A good melody relies on a good rhythm, as does a good song. Starting with rhythm is generally a lot easier than composing the actual contour of the melody (how it progresses on a vertical scale). Once your rhythm is down, it’s simply a matter of moving notes up and down to create your melody.

On a more macro level, and especially if you’re making dance music, getting the groove and rhythm sorted in your track first makes everything else come easier.