Hi there, the market for "handmade cards are relatively competitive to a point however, you can bring something new and unique to the market like I did? then you can make money from it like I do. My cards aren't cheap however; the latter being, do your research into your niche market and most importantly watch your potential competition carefully and plan your business structure from there on.
Firstly, find out if there's a reasonable amount of searches per month for your intended niche via Google Keyword Tool (they will be taking that down later this year by the way)
Spy on your competition website style, pricing, offer structure and are they social and how they branding themselves?
Look at their products and bring something similar but not the same. Better the design or add something to make it your own style
Get a website... outsource this part cheap and if you nothing about how to do it ask a friend or family member to help you
Market it on the internet?this one can be tricky but very essential for getting customers that are willing to pay you for your services. Be careful to pay more than you are profiting when it comes to marketing your website.
Get Traffic to your site?By way of marketing your site?s offer, people will find you and trust you enough to hand you their money in exchange for your product
Have engaging contents and product images?This explains itself just by you and write like you are passionate about your product and take decent images, they don?t have to be professional.
Convert leads to sale?Turn your sites visitors into sales simply by offering them something attractive.
So yes you can make good income if you structure your plans properly and have the right people to support you like my husband does me :-)
You can see this example of my site www.creatingspecialmomnets.co.uk
I wish you every success and you can do it if you have a structured plan in place. GO FOR IT! 