Many good people here to share with. The search engine is a great tool to find out many various setups, equipment. software, and experiences. That is how I became acquainted with many new friends and their individual ways of doing things. I will list a few good threads to get you started.
Always feel free to ask questions. Hope these help you get started. Many more are available for specific needs.
As for using Cubase for Live performance, I would think it would be a bit much on resources. I used Ableton for live several years ago, and it is great for live performance, but again, a powerful, tricked out computer is really needed. This is why I moved to Canabile. I have been 100% virtual instruments for several years. As for improvisation, loops may serve those needs.