I imagine the tabletop community on itch will have lots of posts that you can learn from.
I would recommend just making a prototype for now (no fancy art) and aim to make your card game something to enjoy between you, family and friends. If it takes off then make it into a more commercial product.
And without stirring up an argument...AI can help create batch artwork. Some devs have made card games with art that can rival Magic within a week.
Hope that helps and best of luck :)