What do I do for a dedacated circuit?

First off, Id like to say sorry for all the times this has been asked on this board. I have already read some of the other times this question has been asked. Now that I am ready to do this myself, I thought I would get the opinion of the experts first.

If I have an electrition install a dedicated circuit, would I want that circuit indapendantly grounded?

I am going to buy an outlet from First Impression Music, so I know that I would need copper wire only.

I dont know that much about electricity, but I am assuming I would need a 20 amperes circuit. Is that correct?

My amplifier is plugged directly into the wall recepticle, along with a power conditioner that feeds my pre and cd player.

Would I want to have two dedicated circuits installed so I can run just my power amp off one and my pre & cd player off the other? Or is one fine?

How would I know that the electricion actually did what he was supposed to do? Is there someone I could have come out to my house in the Sacramento, CA. area to actually inspect it? Or is there anyone who is an audiophile/electricion or just a trustworthy electricion who makes it out to the Sacramento, CA. area that you could suggest?

If you could answer my questions for me that would be greatly appreciated!

Thank you