Dissolve yeast in very warm water with Sugar. Let stand to soften, 5 minutes. Stir salt and oil. Add flour as needed, beating until smooth and elastic. Knead until springy 8-10 minutes. Placed in a greased bowl and turn dough to grease top. Cover and let rise in a warm place until doubled (40-45 minutes). Line a 12" pizza pan with dough. Top dough with tomato, Cheese, basil and sun-dried tomatoes. Bake in a pizza oven 8-10 minutes. Place avocado slices in a pinwheel fashion. Serve.