Welcome Anthony,

You have received good answers to your questions so I will add to question #3. BiaB's included sounds are General MIDI (GM)and as you know they are at the bottom of good sounds' category. So here is my workflow using BiaB.

Construct a chord progression and sometimes a melody using the included GM then transfer them to my DAW. BiaB has a number of ways to transfer your song so that is not a problem. In my DAW I will use my much better sounds.

Note I find it much easier to work in my DAW than in BiaB but others do a lot and sometimes all of their work in BiaB. It is a personal choice. I add this as I assume, based on your initial post, you are using a DAW and good sounds so it might be easier for you to do a lot of your work there.

I should note that I work almost exclusively in MIDI.

I hope this helps.

Why is it that doctors call what they do 'practice'?
If flying is so safe, why do they call the airport, the terminal?

64 bit Win 10 Pro, the latest BiaB/RB, Roland Octa-Capture audio interface, a ton of software/hardware