Sources for information and/or advice on dedicated AC lines desired

I have relocated, and the new house will allow me to at long last have dedicated AC power lines in the music listening room. Halleluiah! I’ve seen the topic discussed over the years, and have a general idea of what is needed, but can I get recommendations of sources of information about the details of what the optimum power and wiring system is, and exactly what to have done by a professional electrician (in the event that is necessary) to achieve it? And/or personal advice on wiring and power sources (excluding power conditioners---I mean just raw power. I already have Shunyata and Bybee units for conditioning) required for optimum sound quality? For instance:

- How many separate lines from the main panel to the room? Separate lines for sources vs. amps, analog vs. digital? My system sources are LP, analog tape, digital, and FM radio. Three tube pre-amps, a couple of tube and three SS power amps. And ESL speakers and powered subs also needing AC, of course.

- Amperage advisable for each line? 20 Amps?

- What to look for to determine if the already-installed wire is sufficient? And if it is not, the type and gauge of wire to have installed? 10g Romex?

- Grounding---metal rod into the earth?

- Anything else of concern not listed above.

Thanks for any recommendations of sources of information. Personal recommendations and/or advice also welcomed!