Begin by setting a maximum landing speed and wing loading. If this results in a coeficient of lift that is less than about 1.0 then you can get away without flaps. If the coefficient of lift is greater than about 1.0 for the landing mode then you will need wing flaps. If you just want to do large, high speed maneuvers then a thin symmetrical airfoil will do very nicely. If you don't want to use flaps or a thick airfoil your ability to turn tightly at high speeds will be limited. Selecting an airfoil depends on what specific numbers you want to put on its performance envelope and how lightly you think you can build it. Airfoil selection like most design decisions depends directly or indirectly on everything else about the design and its purpose. The essence of design is to find the balance between conflicting objectives that best meets the mission requirements and priorities.