I first started making styles on the PSR 510 don’t laugh!! It did the job at that time.

I now use the gem genesys. I usually start with the drum tracks then do the bass and then cords and comping.

One technique is to copy one or two tracks from other styles and include them in your new style.

It really depends on
What style of music you are trying to create for,
How many tracks you want to use in your styles
And what your playing style is like.
Also, it is always good before you start making the style to have an idea as to how you want the style to sound after it is done and how you will be using it at a gig.

Once you get the Hang of it, it definitely makes a difference in the quality of the live performance. I personally try to create the styles to make them sound like a live 3 or 4 piece band.

I don’t know specifically about the 9000 and the tyros, but if they are more advance than the psr 510, I am sure that they have the tools to make a decent style.