Pop over to Art Journaling 101 for an introduction to art journaling.
You do not need to know how to paint or draw to work in a journal. It is easy to get started with some simple supplies and everyday ephemera. I discuss art materials for journaling, watercolor and acrylic paints, pens to write on collages and textured backgrounds, adhesives, gesso and more. There are links to books, sites, challenges and journal prompts to inspire you to get started!
Doing art is relaxing and joyful. It allows you to explore your world, express thoughts and feelings through words, color and imagery. An art journal is free of constraints. It is whatever you want it to be. It lets you "draw outside the lines" and remove the box altogether.
The fun is getting lost in the process. It's not about what your pages look like in the end. That's a bonus. Pop over to Art Journaling 101 and get rolling.