any advice on using oracle cards i got for xmas?

Question

they are dolphin and mermaid oracle cards.

Answer 1

was there an instruction book with the cards?
all the advice i can offer when using any sort of divination cards is to bless them each time you use them.
not only will this protect you, you'll find that the cards will give you a clearer and more accurate reading.
good luck and stay safe

Answer 2

Be courageous because you have a LOT to learn.
Dolphin is Delphinus constellation. Mermaid is Andromeda with all her meanings....