^you nailed it.
The naked is a more comfortable seating position with lower footpegs, and higher bars (and doesnt have the bodywork to mangle when
you drop it)
The S has rearsets (footpegs are further back and higher up), clip-ons (the handlebars clamp onto the sides of the forks so they can sit much lower) that lean you forward more into a more aggressive/sportier seating position.
The F is the S model with more bodywork to scratch/break when you drop it (and has since completely replaced the S model)
I dont know how noobish you are but:
If you've never ridden before I strongly suggest taking a riding course (you're an idiot if you dont, especially riding on the mainland)
Spend more money on good gear and less on a new bike than the other way around (heavy work grade jeans will burn though in seconds on asphalt, designer jeans you may as well be naked, and runners are not sufficient for footwear)
As you can probably tell I'm expecting you to drop it, it WILL happen, its just a matter of when (took me 2 years