I just don't see any way to make this work. Grade is just as important on proof coins as it is on business strikes. Can you identify a coin that has been cleaned as opposed to original? Also, what is your planned venue for selling the coins? You certainly can't expect to be the high bidder on ebay, where you are willing to pay more for the coin than anyone else, turn around and put it back on ebay where you are offering it to the same people who were not willing to pay more than you to begin with. You would also have to get enough more than you paid to cover ebay's fees. I wish you luck, but I think you would be better off just learning about coins first, It's sort of like deciding to become an auto mechanic without knowing how engines and cars work.