Sonar comes with BitBridge, and you can use JBridge as well, BUT you still may encounter issues with some 32-bit 3rd-party plugins when using them in a 64-bit Sonar.
Most folks have been moving to using only 64-bit plugins in a 64-bit Sonar, and once this transition is made many many problems seem to go away.
When particular 32-bit plugins are needed - and they don't work well in 64-bit Sonar with either BitBridge or JBridge, then you might want to consider working on that particular project in a 32-bit instance of Sonar. That would avoid having to use any bridging software, BUT you then wouldn't have access to any 64-bit plugins for that project.
I would suggest that AS you learn, you also experiment with the techniques you are learning, so that you aren't trying to keep too many new concepts in your brain at the same time.
In other words, if you are learning about Quick Grouping, set up a dummy project and play around with what you need to do in order to get familiar with Quick Grouping. This way, you will find it easier to get your head around things incrementally, and that should be easier than trying to learn it all at the same time - then try to apply all of the concepts at the same time.
These user forums are a GREAT resource for working through issues, and for when you get stuck trying to understand some of the features. The folks in the forums really work hard at helping other folks. I learn things all the time, and it motivates me to try to help others when I can.
Welcome back - you will REALLY like the incredible things you can do these days with Sonar, and with plugins like Kontakt and all the available libraries for it.
I also recommend you spend some time learning about setting up Track Templates. They are incredibly helpful time savers and super powerful.
Bob Bone