I linked to the current Roland online manual for your keyboard a couple pages earlier in this thread, that is the one I have been referring to as far as pages go. Since it is what is listed on the Roland site, it may be worth looking at to see if they updated it and made it a little more understandable since you bought your board. Roland is known for this, as well as for writing new operating systems for some of their keyboards to add features.
My Juno-G got an OS update that allows it to be a sampler now (in the conventional sense). It could always record and trigger what was recorded but now it has features to make using it as an actual sampler much easier. Nice when its free!
I think Roland is larger than you stated earlier as a company; they have a lot of subsidiaries and products. I have met quite a few of their reps, etc, as my parents own a music store and are involved with some large groups promoting music education. Also, PGMusic is NOT just Peter and his brother. Once you get the hang of the programs, see if you can get involved with Beta testing and 'meet' some of the great programmers behind the software... plus the sales and support team, the web team, they are growing fast!
Spendyour time where you think you need it. Having fun is the important part. Stop by when questions arise.