[CardboardCollector]

I have not bought or sold anything through an AH, but thinking about selling a few of my higher condition pre-war items using an AH. So all of my stuff is raw, so higher condition may be a relative term.

Do most AH charge a seller percentage of the sale?
Can you negotiate the seller's percentage?
When I send my cards to the AH? assuming I need to insure them when shipped, but do AH's have insurance in case of loss or damage?
My cards are raw, would the AH send them in for grading? Who covers this cost?

Thanks in advance