Buy cardstock from an office supply store, use a search engine to find a business card template, and print your own.
The most important things you can put on a business card are your name, address, phone number, and email. Don't put a lot of stuff on the card just because you want to show off how creative you are, don't put anything on the card that isn't necessary. You want to look mature and businesslike, you do NOT want to look like someone who is easily distracted from the business at hand. You might put a small photo of yourself on the card, just so that your customers are reminded of who you are and what you look like. Don't use small print, if your information is hard to read then your potential customers might just toss it.