tip ....
there is no easier way. one is the product of the other. you might make a cracker of a beat by a series of words at intervals that dictate what the music is going to sound like. on the other hand, you may have a chord progression that lends itself to words.
there is no right or wrong way. neither is better than the other and it becomes a personal thing. lyricists are not neccessarily musicians and likewise musicians are not neccessarily lyricists. you'll find that one time the lyrics come first and then the melody and the next ..... it's the music that "coins" a phrase.
if you're just starting out, don't fret, so to speak, over what comes first. you'll find your groove and it will just happen.
my personal experience is both at the same time!
les