KnittersPride has two interchangeable needle sets that are for trying out different materials and shapes. If you aren't sure yet whether you prefer wood or metal or another material I would ask for one of these sets plus the swivel cords from the mindful collection and possibly the connectors.

https://www.amazon.com/Knitters-Pride-Comby-Interchangeable-Sampler/dp/B00QHDHXOK/

https://www.amazon.com/Knitters-Pride-Interchangeable-Knitting-Needles/dp/B0768NB7XK/

https://www.amazon.com/Knitters-Pride-Knitting-Interchangeable-Markings/dp/B097TSNW4P/

https://www.amazon.com/Knitters-Pride-Cord-Connectors-Cable/dp/B006R9JCTI/