The shiny "Pro" symbol likely means they are in Ultra-Pro sleeves. The sleeves themselves are mostly worthless after being used.
As for identifying the cards, the bottom right side of the card has a card number. It looks like this:
X R XXX.
The first "X" represents the set number. Where I inserted "R," you might also see C, U, P, S, or O. The third set of "XXX" represents the card number in the set.
R = Rare
U = Uncommon
C = Common
P = Promo or Premium
S = Starter Deck Only
Less commonly, you may see:
O = Masterworks
R+ = Rare Plus (Set 9 only)
RF = Rare Foil (later sets only)
If you just list the "R" cards, O cards, R+ cards, and RF cards. And I guess list any P cards as well.
Any card which has the image "foiled" should be listed regardless of rarity. Please denote on your list that the cards is a foil.
That should be able to give a good estimate.
-wtk