My advice would be to start CASEing cards you love. Don't try to be original yet, just learn from the "vintage masters" and copy them as exactly as you can.
That's what they used to do with painters - make them copy great works of art before they let them paint their own paintings.
As you duplicate these cards you admire so much, you will begin to understand how they are constructed, what elements play into their look, what is necessary to make a card "vintage". You will have insights and make discoveries.
Looking at things is not the same as doing them with your own hands.
Good luck and have fun!