You can make money by selling anything if you put your mind to it. How successful you could be depends on you and how much you put into it. I have never tried it personally, but I know somebody who sold homemade items. There are a lot of things you can try and really the sky is the limit. First off you will want to get the word out that you are selling them and you want them to be a decent price. Also you will want some sort of game plan for your 'business.' For example are you going to do something like hallmark and have cards pre-made so people can just stop in and pick them up off of some sort of stand or are you doing special orders, or both. Try getting a booth at a local or nearby craft fair to get your product out. Street fairs, art streets, any of these types of things are good places to start! You can also attempt to sell them broader than locally, but the best place to start is local. Make up a business plan because you do not want to go into it blind and do not be afraid to use social media sites as well as friends, neighbors, and family... you will need support and you have to start somewhere. Most importantly though... you have to be available for people to get the cards!!! If you get your name out but you are not available nobody will buy them. Make it work for you and I am sure you can do it (especially if they are good!) :-) Good Luck!!