In a large bowl, combine all ingredients, mix together until you have a smooth dough. Wash your hands (you're going to want your hands to be clean after kneading the dough to make sure you have the right consistency), and let the dough rest for 5 minutes. Your dough should be smooth, and not stick to your hands. A good way to test if it is ready, is to roll into a ball and flatten--if the edges of the arepa crack, it needs a little more water. If it sticks to your hands easily, add a little more flour and knead again.

Once your dough is at the right consistency, roll into six balls and flatten into disks that are about 1/2" thick. Brush with a little oil on both sides.

Head an electric skillet OR a large cast iron pan over medium high heat, with enough oil to cover the bottom of the pan. Add in the disks and cook for 6-8 minutes on each side, or until golden brown on each side, but not burnt. Remove from heat, cool for 5 minutes, and then slice and fill with whatever you like!