The most common business card size is 84 mm by 55 mm, or 3.5 inches by 2 inches. You can go bigger, but if you do your cards are less likely to be kept. If you go smaller, you have a better shot, as long as they still fit in a typical card folio. Any non-traditional size is going to cost you more money.
A professional business card needs to fit the branding of your business, display your logo prominently, and highlight your website and contact details, so the people you connect with can find you online, on social, or via email.
There are a lots of ways to make a visual statement with your business card. Whether it is adding a dash of playful creativity or introducing photos in an unexpected style. Making great use of icons, adding your logo and embellishments, or giving a visual nod to your expertise, are excellent ways to punch up your business card. Your design should make a visual statement that gives the innovative feel of your business to every prospect you hand your card to.
Most business cards are paper, although there are lots of other options, from plastic and wood to metal and slate. Assuming you go with paper, you need to choose thickness, coating, color and weight. All of these can affect the price.