Decide what type of card you want to make first. I like sentimental cards. I either write a special poem or a paragraph especially for the one to receive the card. I can type this on the computer and print it out or I can write it by hand with a good black or other color gel pen. I prefer gel pens to marker pens.
Gel pens write more smoothly and evenly.
But wait a second after writing because the ink has to dry. ONE Write a poem or special saying. If you can't write poetry, look through a poetry book for ideas. Since this is a personal card you can copy a poem or an excerpt to include in your card. I'd give credit to the original source though.