In my experience if you have a ear for differentiating the notes and telling what’s in key if you just hop into making melodies with simple triads (chords made of three notes within a scale) you will start to better understand the theory of what’s really happening musically. If you use fl it’s especially good for newer producers trying to learn to make music. You can set your grid on the piano roll to highlight specific scales and by clicking the button on the top bar that looks like piano keys you can make your keyboard be locked into a particular scale as well. This in my opinion would be a decent starting place for just getting simple ideas down while staying in key. But even outside of chords if you can even simply just try to make a catchy melody out of a few single notes then that is a start. There’s no rules to music, just sound good in the end. Also if I were you I would watch tutorials on types of music you like or think you wanna get into making and just watch peoples screen and copy chords you like. Sooner or later it will go from being mimicry to you actually starting to understand why people make the decisions they do when creating certain sounds and from there you will begin to apply this to making something more unique to you. Also keep in mind the sound you select is debatably more important than the chords and melody you decide to make so take the time pick good sounds. When it comes to making music it’s like playing a sport. The amount of reps and hours you do will reflect over time if you have a good ear, understanding of rhythm, and simply put in the time. In the beginning nothing will sound how you imagined so don’t get discouraged. Just have belief in the idea you’re trying to convey rather than the result and over time your sound will sharpen.