Bill there are a couple ways to tackle this..
Producing a great SMF is an art that very few can do..

It takes a good ear and very good keyboard chops to pull it off.

Most people I know can not do it , to the extent of the top guys that produce commercial files..

Personally I know of three people that are good at this..and I know hundreds that try..

Bill, the easiest way is to find a style close to what you need..Listen primarily to the bass and drums, these are the heart to a sequence..If you have the capabilities to combine other parts of one style to another..this can save you much time..
I am not sure you can do this with a PSR2000, maybe someone can confirm.

I also recall the sequencer on the PSR2100 was not up to parr for this job..

Look into PG Music's Powertracks[under $50].

When you get the basic bass and drums, you can try and add the signature parts to a tune...intro, turnaround etc...Be sparse with the notes you add..remember they all use polyphony, and you only have 64...

Good luck, if I can help you farther , email me..