If you are interested in giving QR codes a shot, here is a quick tutorial on creating a code to use and also making it the size needed for printing purposes. This is just to help you get users to visit a URL (website). Keep in mind that if they are using your QR code, that they are doing so from a mobile device, so make sure the landing page is mobile friendly!
First, you will go to http://goo.gl, which is Google’s URL shortener. You have probably used bit.ly, ow.ly, or some other URL shortener, but this is Google’s.
Next, you will type in a URL that you would like users to check out upon scanning. It looks like this:

Then, click “details” just above where it tells you which page you are on. Once you do this, you will see your QR code. The QR code automatically defaults to the 150×150 size. If this size is sufficient for you, all you need to do is right click on the code and select Save Image As, and save it in the directory desired on your computer.

If you need a larger version for posters, t-shirts, or other print promotions, you can increase the size to 300×300 by just a couple of easy steps.
First, you will copy the URL under the QR code. Then you’ll paste it into your address bar, and go to the URL.

You will then see a page with nothing but your QR Code. To change the size, go back up to the URL and look for the numbers 150×150. You will change them to 300×300.

Hit enter, and then your larger QR code will display. From here, follow the same steps as saving the original code, and you are ready for use!