Oh yeah, new nodes can be created by clicking the node box in the corner. There are a lot of things to learn, but the above advice should get you through the basics. Remember, the shader nodes will only be recognized by firefly in either draft or production modes. To speed your previews, make sure you disable displacement unless you need it. Displacement doesn't actually change the model itself until render, and is very processor intensive as firefly has to calculate it at that time. If it's enabled, firefly will try to calculate it, whether its there or not.