I think the procedures in general that you are thinking about are things that would be covered in the driver meeting, or would be consistently done within a region's races - they aren't usually decided on the fly, so you don't need a real-time receiver.
Sorry in advance for the rookie question, but many of the rules use terms like "as directed/instructed by the Race Director" like how to restart after red, etc.
Aside from use of flags/sign boards, how else are these things communicated? Is there a one-way or two-way radio that can be used to communicate with Race Control? I'll be running solo and won't otherwise have a team/pit crew to advise me.