What’s the rush? If you don’t find a GF that week, there is always the next week. Regardless of when it happens, finding a significant other almost always starts with introducing yourself then saying something complimentary to the person. If they are interested, they will say something nice back. If they don’t, respect them by backing off. An even better approach is to change your goal to finding some friends. With luck, one of those friendships will grow into a deeper relationship.