You can learn about synthesis by spending a few weekends in front of your Virus with the manual. It sounds a bit boring when all you want to do is get on with it and make tunes, but once you learn about it a bit, you can hear a sound in a tune and have a pretty good idea about how it's constructed.
You can also post sample of sounds you want to make on websites such as this and others and have experienced sound designers tell you how
