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At least with point 5 i can help you.
Alpha Channel is used by adding a Math Node with the Operation 'Select W' (maybe W stands for weight?) that is connected to a Transparency Input of Uber/PRB Shader or to a Shader Blends Weight using a Transparent Shader on Input 'Shader 2' as seen in the screenshot i appended to this message.
In general i recommend to make extensive use of the 'Cycles to RPR Converter' to learn, how the RPR-Nodes work.
Even though, a detailed description of all the settings in the Users Manual would be great.
Thank you Johannes, i will check for it!