You can get started with wood burning by purchasing an inexpensive kit from any craft store. We bought one for about $30 at JoAnn last year, and it came with multiple tips to help create different designs. There are many tutorials online to help you learn how to do it, and creating a pattern is as simple as tracing a design onto a piece of wood.
You can get wood pieces from a local saw mill or woodworker, or even use branches and bits of wood you may find around your home. Craft stores also sell wood blanks so you can buy those if you prefer. Most are fairly inexpensive.
One of my favorite things about wood burning is the beautiful aroma that wafts up as you work on a piece. The smoky, heady scent of wood is the best part of the process, in my opinion.
If you take a look on Etsy.com, you will find some amazing works of art and get ideas on how much your own art might sell for. From pictures to wood burned gourds and neat treasure boxes and trinkets in between, you can use wood burning for a wide variety of art projects.