My advice is that you can honestly make a song about ANYTHING :D
(I don't really have lyrics or instruments)
But maybe you can play the guitar or the piano!!
what do you want the song to be about???
-sun
- rain
-your life
-love
heartbreak
-etc <3
do you want the song to be...
-pop
-rock
- hip pop
so much more stuff I could say I hope this helps a little good luck on your song comment if you have any questions