If you search for 'high fiber foods' in google, tons of sites will pop up. Here is one from the Mayo clinic.
http://www.mayoclinic.com/health/hig...-foods/NU00582
You can also use calorieking.com or something similar to search for fiber contents of specific foods.
The closer you eat to food in its natural state, the more likely you will be eating more fiber. Of course some things are fiber enriched like cereal grains. It also comes with practice after time. I don't even think about fiber but I get around 100 grams per day.
I didn't even really think about the amount of fiber in my breakfast this morning and that alone was around 20 grams of fiber.