A couple of weeks ago we posted a showcase of sketched UI wireframes. It illustrated how starting out on paper can be an effective way to begin the design process. It allows you to quickly mockup ideas and get the creative juices flowing. When creating these sketches, it’s good to have a guide or starting point. Here we’ve rounded up 10 free printable templates that will help you get started with your own wireframe sketches.
Here's some other articles that you will definitely find useful.