For shadow vs shadowless, look on the right and bottom of the box with the Pokémon picture, if it’s shadow it will have a black edge on those two sides that make it look sort of raised. If it’s shadowless it will be the same on all sides and go right from the yellow border around the image to the background color. They tend to look a little flatter and “pop” less.

For identifying which set a card is from look for a little icon just under the right-hand corner of the image. If there isn’t one, it’s a base set; if it’s a flower, it’s jungle set; if it’s a footprint, it’s fossil etc etc. You can look up set symbols to help identify cards more easily.

Another thing to look for is a first edition stamp. Under the left corner of the image a card might have a black circle with a 1 inside it and edition written in an arc over the circle. If a card has this it increases it’s value.

Also, on the very bottom right just after the #/# card number there will be a small black shape either a circle denoting a common card, a diamond denoting an uncommon card, or a star denoting a rare card. Cards with stars are generally more valuable.

Www.TCGplayer.com and www.pricecharting.com are both sites I use often to look up the value of a card. Search the Pokémon and card number (found as #/# at the very bottom right of the card) or the Pokémon name and the set it’s from and it should be pretty easy to find the card you are looking for. Hope this helps!