Really depends on what type of scents you like. You’ll be testing a lot, so might as well get scents you won’t mind smelling all the time! I really like spa and aquatic fragrances, so I have more of those than anything else. Some people have tons of florals, others have a lot of bakery scents, and still others have more exotic/ masculine scents.
But, generally speaking, I would say Vanilla, Apple, and Cinnamon are good starter scents.
They are generally crowd pleasing and good selling scents.