Acrylics eats up brushes so is no use buying too expensive. A small set if you want to try a new brand. Some are more liquidy than others. The name brands usually do not have a smell. Some color it pays buying a big tube or medium tube and some not.Primary colors you can mix colors yourself. The Youtube channel Little Art Talks she did a very good video on what to look for when buying acrylics both the student quality and the artist quality. Wetcanvas forum the acrylics section also has tons of information on this. I tried different brands. These days I buy open stock.
Sets always have colors I do not use or use very seldom. Is same for items like pastels, watercolors etc. Have fun with acrylics it is a great medium. A heavy paper journal like A5 size is nice to do small work or practice.