The fundamentals are just 'Here this is a song' hehe. I mean some dudes like real instruments. Make a drum beat throw a bassline under it, some funky guitar rhythms, a good vinyl loop in the background, etc. This next guy, he's into electro sounds. He starts with his drum beat, then makes a bassline with a synth, and makes a cool lead line with his buddies old Roland Juno or something. Me? Im bored with 30 years of conventional music. Might start with a drum beat, then start sampling random shit around the house thats making noise to make into alien noises in the background. Sometimes I dont even use drums, sometimes its just jamming running stuff through delay pedals or my rack or maybe just setting up my modular synth to trigger and play itself til the power dies. What kind of stuff inspires you? What kind of sounds do YOU like? What kind of stuff do YOU want to hear in your music? Thats the correct answer. Hell I have the opposite problem. I hear TOO much all day long and scramble like crazy to try and get it all down before I die hah.
We cant tell you the magic formula to write, cause there isn't one. If there was, we'd all be rich by now and wouldn't be hanging out on the internet hah.