You could begin with this split primary palette of artist quality paint and have enough left over for a versatile palette box of your own choosing.

https://www.amazon.com/Daniel-Smith-Ensemble-Watercolor-Mixing/dp/B07FB4SPSH/ref=sr_1_2?dchild=1&keywords=DANIEL+SMITH&qid=1632249315&sr=8-2

I use one like this

https://www.amazon.com/18-Wells-Watercolor-Moisturizing-Foldable-Portable/dp/B07R5GC1HR/ref=sr_1_22?crid=VSF0T5PPM6AJ&dchild=1&keywords=palette+box&qid=1632249540&sprefix=Palette+bo%2Caps%2C169&sr=8-22