Place flank steak on work surface. Trim uneven end. Using meat mallet, pound flank steak into 9- by 10-inch rectangle, pounding thick end to 1/4 inch thickness. Whisk garlic and 2 tablespoons oil in small bowl to blend. Brush over steak. sprinkle with salt and pepper. cover mean with arugual, leaving 3- inch-wide plain border along one long side. Cover arugula with red pepper, prosciutto, and Gouda. Starting at one long side, roll up steak tightly and tie with cooking string. Whisk flour, paprika, 2 teaspoons salt and 1 teaspoon pepper in large shallow dish. Roll meat in flour mixture to coat.