Printing isn't something most of us do when we're first starting out, but as our careers develop it becomes more and more important to deliver the highest quality images to clients for them to print and use for advertising in magazines, posters, and maybe even billboards. But does size really matter?
James Popsys is a photographer and graphic artist. His argument is that the size of print of an image that comes from your camera can be enlarged as much as needed as long as the viewer is at the logical distance from the print.
I've been up close to some billboards, and it's true, all you see are dots of color. It's about the distance you'll be standing from the print that makes all the difference. 300 DPI will work for a magazine print, but a billboard won't need so much detail so the dpi can be reduced. If you're at a distance from a large image, your eyes can still make sense of the image, without it coming across as being of less quality.
Firstly, print some of your work and go through the process of checking all the different aspects that affect the color and quality of the print. Secondly, don't worry too much about the size of the sensor or what the web says you can print at. The fact that you shoot, with whatever gear you have, is the most important part of the process. You'll most likely be able to print at whatever size you need.