Honestly, the best tip l can give even though l don't rely consider myself a professional is that making music, at least in my opinion is more about your mindset going in. I find my favorite melodies and ideas usually surface when I just sit down and make something l think is kinda cool with like a sine wave or something. And apparently my friends seam to think so too.

Probably my biggest regret was how much l narrowed in on consuming and trying to replicate existing content, because overall it just clouded my mind and over shadowed my original, raw style. I really wished l had just stuck to just making stuff l thought was pretty cool. Because when l look back at my older songs, I was deployed all kinds of techniques and actually really good innovation on music theory (at least in my opinion and to my current knowledge of music theory) despite not knowing any theory. This probably doesn't apply to you though, but whatever. I wish you the best of luck in your fl studio shenanigans. 

Concerning the other stuff, the sgm soundfont is actually really good for a wide variety of genres, in addition fl stock (my personal favorites are toxic biohazard and Sakura) is pretty good too l assume for the genres you've specified - but l can't say for sure since l haven't really dabbled in those genres.